This selection from the Preface to the Dictionary corresponds to the selection in Stuart Sherman's volume 1C of the Longman Anthology of British Literature. I've added paragraph numbers for ease of reference.
 It is the fate of those who toil at the lower employments of life, to be rather driven by the fear of evil, than attracted by the prospect of good; to be exposed to censure, without hope of praise; to be disgraced by miscarriage, or punished for neglect, where success would have been without applause, and diligence without reward.
 Among these unhappy mortals is the writer of dictionaries; whom mankind have considered, not as the pupil, but the slave of science, the pionier of literature, doomed only to remove rubbish and clear obstructions from the paths of Learning and Genius, who press forward to conquest and glory, without bestowing a smile on the humble drudge that facilitates their progress. Every other authour may aspire to praise; the lexicographer can only hope to escape reproach, and even this negative recompence has been yet granted to very few.
 I have, notwithstanding this discouragement, attempted a dictionary of the English language, which, while it was employed in the cultivation of every species of literature, has itself been hitherto neglected, suffered to spread, under the direction of chance, into wild exuberance, resigned to the tyranny of time and fashion, and exposed to the corruptions of ignorance, and caprices of innovation.
 When I took the first survey of my undertaking, I found our speech copious without order, and energetick without rules: wherever I turned my view, there was perplexity to be disentangled, and confusion to be regulated; choice was to be made out of boundless variety, without any established principle of selection; adulterations were to be detected, without a settled test of purity; and modes of expression to be rejected or received, without the suffrages of any writers of classical reputation or acknowledged authority.
 Having therefore no assistance but from general grammar, I applied myself to the perusal of our writers; and noting whatever might be of use to ascertain or illustrate any word or phrase, accumulated in time the materials of a dictionary, which, by degrees, I reduced to method, establishing to myself, in the progress of the work, such rules as experience and analogy suggested to me; experience, which practice and observation were continually increasing; and analogy, which, though in some words obscure, was evident in others.
 That part of my work on which I expect malignity most frequently to fasten, is the Explanation; in which I cannot hope to satisfy those, who are perhaps not inclined to be pleased, since I have not always been able to satisfy myself. To interpret a language by itself is very difficult; many words cannot be explained by synonimes, because the idea signified by them has not more than one appellation; nor by paraphrase, because simple ideas cannot be described. When the nature of things is unknown, or the notion unsettled and indefinite, and various in various minds, the words by which such notions are conveyed, or such things denoted, will be ambiguous and perplexed. And such is the fate of hapless lexicography, that not only darkness, but light, impedes and distresses it; things may be not only too little, but too much known, to be happily illustrated. To explain, requires the use of terms less abstruse than that which is to be explained, and such terms cannot always be found; for as nothing can be proved but by supposing something intuitively known, and evident without proof, so nothing can be defined but by the use of words too plain to admit a definition.
 Other words there are, of which the sense is too subtle and evanescent to be fixed in a paraphrase; such are all those which are by the grammarians termed expletives, and, in dead languages, are suffered to pass for empty sounds, of no other use than to fill a verse, or to modulate a period, but which are easily perceived in living tongues to have power and emphasis, though it be sometimes such as no other form of expression can convey. . . .
 The solution of all difficulties, and the supply of all defects, must be sought in the examples, subjoined to the various senses of each word, and ranged according to the time of their authours.
 When first I collected these authorities, I was desirous that every quotation should be useful to some other end than the illustration of a word; I therefore extracted from philosophers principles of science; from historians remarkable facts; from chymists complete processes; from divines striking exhortations; and from poets beautiful descriptions. Such is design, while it is yet at a distance from execution. When the time called upon me to range this accumulation of elegance and wisdom into an alphabetical series, I soon discovered that the bulk of my volumes would fright away the student, and was forced to depart from my scheme of including all that was pleasing or useful in English literature, and reduce my transcripts very often to clusters of words, in which scarcely any meaning is retained; thus to the weariness of copying, I was condemned to add the vexation of expunging. Some passages I have yet spared, which may relieve the labour of verbal searches, and intersperse with verdure and flowers the dusty desarts of barren philology.
 The examples, thus mutilated, are no longer to be considered as conveying the sentiments or doctrine of their authours; the word for the sake of which they are inserted, with all its appendant clauses, has been carefully preserved; but it may sometimes happen, by hasty detruncation, that the general tendency of the sentence may be changed: the divine may desert his tenets, or the philosopher his system.
 Some of the examples have been taken from writers who were never mentioned as masters of elegance or models of stile; but words must be sought where they are used; and in what pages, eminent for purity, can terms of manufacture or agriculture be found? Many quotations serve no other purpose, than that of proving the bare existence of words, and are therefore selected with less scrupulousness than those which are to teach their structures and relations.
 My purpose was to admit no testimony of living authours, that I might not be misled by partiality, and that none of my cotemporaries might have reason to complain; nor have I departed from this resolution, but when some performance of uncommon excellence excited my veneration, when my memory supplied me, from late books, with an example that was wanting, or when my heart, in the tenderness of friendship, solicited admission for a favourite name.
 So far have I been from any care to grace my pages with modern decorations, that I have studiously endeavoured to collect examples and authorities from the writers before the restoration, whose works I regard as the wells of English undefiled, as the pure sources of genuine diction. Our language, for almost a century, has, by the concurrence of many causes, been gradually departing from its original Teutonick character, and deviating towards a Gallick structure and phraseology, from which it ought to be our endeavour to recal it, by making our ancient volumes the ground-work of stile, admitting among the additions of later times, only such as may supply real deficiencies, such as are readily adopted by the genius of our tongue, and incorporate easily with our native idioms.
 But as every language has a time of rudeness antecedent to perfection, as well as of false refinement and declension, I have been cautious lest my zeal for antiquity might drive me into times too remote, and croud my book with words now no longer understood. I have fixed Sidney's work for the boundary, beyond which I make few excursions. From the authours which rose in the time of Elizabeth, a speech might be formed adequate to all the purposes of use and elegance. If the language of theology were extracted from Hooker and the translation of the Bible; the terms of natural knowledge from Bacon; the phrases of policy, war, and navigation from Raleigh; the dialect of poetry and fiction from Spenser and Sidney; and the diction of common life from Shakespeare, few ideas would be lost to mankind, for want of English words, in which they might be expressed.
 It is not sufficient that a word is found, unless it be so combined as that its meaning is apparently determined by the tract and tenour of the sentence; such passages I have therefore chosen, and when it happened that any authour gave a definition of a term, or such an explanation as is equivalent to a definition, I have placed his authority as a supplement to my own, without regard to the chronological order, that is otherwise observed.
 Some words, indeed, stand unsupported by any authority, but they are commonly derivative nouns or adverbs, formed from their primitives by regular and constant analogy, or names of things seldom occurring in books, or words of which I have reason to doubt the existence.
 There is more danger of censure from the multiplicity than paucity of examples; authorities will sometimes seem to have been accumulated without necessity or use, and perhaps some will be found, which might, without loss, have been omitted. But a work of this kind is not hastily to be charged with superfluities: those quotations which to careless or unskilful perusers appear only to repeat the same sense, will often exhibit, to a more accurate examiner, diversities of signification, or, at least, afford different shades of the same meaning: one will shew the word applied to persons, another to things; one will express an ill, another a good, and a third a neutral sense; one will prove the expression genuine from an ancient authour; another will shew it elegant from a modern: a doubtful authority is corroborated by another of more credit; an ambiguous sentence is ascertained by a passage clear and determinate; the word, how often soever repeated, appears with new associates and in different combinations, and every quotation contributes something to the stability or enlargement of the language. . . .
 I have sometimes, though rarely, yielded to the temptation of exhibiting a genealogy of sentiments, by shewing how one authour copied the thoughts and diction of another: such quotations are indeed little more than repetitions, which might justly be censured, did they not gratify the mind, by affording a kind of intellectual history.
 A large work is difficult because it is large, even though all its parts might singly be performed with facility; where there are many things to be done, each must be allowed its share of time and labour, in the proportion only which it bears to the whole; nor can it be expected, that the stones which form the dome of a temple, should be squared and polished like the diamond of a ring.
 Of the event of this work, for which, having laboured it with so much application, I cannot but have some degree of parental fondness, it is natural to form conjectures. Those who have been persuaded to think well of my design, require that it should fix our language, and put a stop to those alterations which time and chance have hitherto been suffered to make in it without opposition. With this consequence I will confess that I flattered myself for a while; but now begin to fear that I have indulged expectation which neither reason nor experience can justify. When we see men grow old and die at a certain time one after another, from century to century, we laugh at the elixir that promises to prolong life to a thousand years; and with equal justice may the lexicographer be derided, who being able to produce no example of a nation that has preserved their words and phrases from mutability, shall imagine that his dictionary can embalm his language, and secure it from corruption and decay, that it is in his power to change sublunary nature, or clear the world at once from folly, vanity, and affectation.
 With this hope, however, academies have been instituted, to guard the avenues of their languages, to retain fugitives, and repulse intruders; but their vigilance and activity have hitherto been vain; sounds are too volatile and subtile for legal restraints; to enchain syllables, and to lash the wind, are equally the undertakings of pride, unwilling to measure its desires by its strength. The French language has visibly changed under the inspection of the academy; the stile of Amelot's translation of father Paul is observed by Le Courayer to be un peu passè; and no Italian will maintain, that the diction of any modern writer is not perceptibly different from that of Boccace, Machiavel, or Caro.
 Total and sudden transformations of a language seldom happen; conquests and migrations are now very rare: but there are other causes of change, which, though slow in their operation, and invisible in their progress, are perhaps as much superiour to human resistance, as the revolutions of the sky, or intumescence of the tide. Commerce, however necessary, however lucrative, as it depraves the manners, corrupts the language; they that have frequent intercourse with strangers, to whom they endeavour to accommodate themselves, must in time learn a mingled dialect, like the jargon which serves the traffickers on the Mediterranean and Indian coasts. This will not always be confined to the exchange, the warehouse, or the port, but will be communicated by degrees to other ranks of the people, and be at last incorporated with the current speech.
 There are likewise internal causes equally forcible. The language most likely to continue long without alteration, would be that of a nation raised a little, and but a little, above barbarity, secluded from strangers, and totally employed in procuring the conveniencies of life; either without books, or, like some of the Mahometan countries, with very few: men thus busied and unlearned, having only such words as common use requires, would perhaps long continue to express the same notions by the same signs. But no such constancy can be expected in a people polished by arts, and classed by subordination, where one part of the community is sustained and accommodated by the labour of the other. Those who have much leisure to think, will always be enlarging the stock of ideas, and every increase of knowledge, whether real or fancied, will produce new words, or combinations of words. When the mind is unchained from necessity, it will range after convenience; when it is left at large in the fields of speculation, it will shift opinions; as any custom is disused, the words that expressed it must perish with it; as any opinion grows popular, it will innovate speech in the same proportion as it alters practice.
 As by the cultivation of various sciences, a language is amplified, it will be more furnished with words deflected from their original sense; the geometrician will talk of a courtier's zenith, or the excentrick virtue of a wild hero, and the physician of sanguine expectations and phlegmatick delays. Copiousness of speech will give opportunities to capricious choice, by which some words will be preferred, and others degraded; vicissitudes of fashion will enforce the use of new, or extend the signification of known terms. The tropes of poetry will make hourly encroachments, and the metaphorical will become the current sense: pronunciation will be varied by levity or ignorance, and the pen must at length comply with the tongue; illiterate writers will at one time or other, by publick infatuation, rise into renown, who, not knowing the original import of words, will use them with colloquial licentiousness, confound distinction, and forget propriety. As politeness increases, some expressions will be considered as too gross and vulgar for the delicate, others as too formal and ceremonious for the gay and airy; new phrases are therefore adopted, which must, for the same reasons, be in time dismissed. Swift, in his petty treatise on the English language, allows that new words must sometimes he introduced, but proposes that none should be suffered to become obsolete. But what makes a word obsolete, more than general agreement to forbear it? and how shall it be continued, when it conveys an offensive idea, or recalled again into the mouths of mankind, when it has once by disuse become unfamiliar, and by unfamiliarity unpleasing.
 There is another cause of alteration more prevalent than any other, which yet in the present state of the world cannot be obviated. A mixture of two languages will produce a third distinct from both, and they will always be mixed, where the chief part of education, and the most conspicuous accomplishment, is skill in ancient or in foreign tongues. He that has long cultivated another language, will find its words and combinations croud upon his memory; and haste or negligence, refinement or affectation, will obtrude borrowed terms and exotick expressions.
 The great pest of speech is frequency of translation. No book was ever turned from one language into another, without imparting something of its native idiom; this is the most mischievous and comprehensive innovation; single words may enter by thousands, and the fabrick of the tongue continue the same, but new phraseology changes much at once; it alters not the single stones of the building, but the order of the columns. If an academy should be established for the cultivation of our stile, which I, who can never wish to see dependance multiplied, hope the spirit of English liberty will hinder or destroy, let them, instead of compiling grammars and dictionaries, endeavour, with all their influence, to stop the licence of translatours, whose idleness and ignorance, if it be suffered to proceed, will reduce us to babble a dialect of France.
 If the changes that we fear be thus irresistible, what remains but to acquiesce with silence, as in the other insurmountable distresses of humanity? it remains that we retard what we cannot repel, that we palliate what we cannot cure. Life may be lengthened by care, though death cannot be ultimately defeated: tongues, like governments, have a natural tendency to degeneration; we have long preserved our constitution, let us make some struggles for our language.
 In hope of giving longevity to that which its own nature forbids to be immortal, I have devoted this book, the labour of years, to the honour of my country, that we may no longer yield the palm of philology to the nations of the continent. The chief glory of every people arises from its authours: whether I shall add any thing by my own writings to the reputation of English literature, must be left to time: much of my life has been lost under the pressures of disease; much has been trifled away; and much has always been spent in provision for the day that was passing over me; but I shall not think my employment useless or ignoble, if by my assistance foreign nations, and distant ages, gain access to the propagators of knowledge, and understand the teachers of truth; if my labours afford light to the repositories of science, and add celebrity to Bacon, to Hooker, to Milton, and to Boyle.
 When I am animated by this wish, I look with pleasure on my book, however defective, and deliver it to the world with the spirit of a man that has endeavoured well. That it will immediately become popular I have not promised to myself: a few wild blunders, and risible absurdities, from which no work of such multiplicity was ever free, may for a time furnish folly with laughter, and harden ignorance in contempt; but useful diligence will at last prevail, and there never can be wanting some who distinguish desert; who will consider that no dictionary of a living tongue ever can be perfect, since while it is hastening to publication, some words are budding, and some falling away; that a whole life cannot be spent upon syntax and etymology, and that even a whole life would not be sufficient; that he, whose design includes whatever language can express, must often speak of what he does not understand; that a writer will sometimes be hurried by eagerness to the end, and sometimes faint with weariness under a task, which Scaliger compares to the labours of the anvil and the mine; that what is obvious is not always known, and what is known is not always present; that sudden fits of inadvertency will surprize vigilance, slight avocations will seduce attention, and casual eclipses of the mind will darken learning; and that the writer shall often in vain trace his memory at the moment of need, for that which yesterday he knew with intuitive readiness, and which will come uncalled into his thoughts to-morrow.
 In this work, when it shall be found that much is omitted, let it not be forgotten that much likewise is performed; and though no book was ever spared out of tenderness to the authour, and the world is little solicitous to know whence proceeded the faults of that which it condemns; yet it may gratify curiosity to inform it, that the English Dictionary was written with little assistance of the learned, and without any patronage of the great; not in the soft obscurities of retirement, or under the shelter of academick bowers, but amidst inconvenience and distraction, in sickness and in sorrow: and it may repress the triumph of malignant criticism to observe, that if our language is not here fully displayed, I have only failed in an attempt which no human powers have hitherto completed. If the lexicons of ancient tongues, now immutably fixed, and comprised in a few volumes, be yet, after the toil of successive ages, inadequate and delusive; if the aggregated knowledge, and co-operating diligence of the Italian academicians, did not secure them from the censure of Beni; if the embodied criticks of France, when fifty years had been spent upon their work, were obliged to change its oeconomy, and give their second edition another form, I may surely be contented without the praise of perfection, which, if I could obtain, in this gloom of solitude, what would it avail me? I have protracted my work till most of those whom I wished to please, have sunk into the grave, and success and miscarriage are empty sounds: I therefore dismiss it with frigid tranquillity, having little to fear or hope from censure or from praise.