Pope was able to keep his heroic couplets interesting by varying the position of the caesurae, as here:
Alas how changed! || What sudden horrors rise!
A naked lover || bound and bleeding lies!
Where, where was Eloise? || her voice, her hand,
Her poniard, || had opposed the dire command.
Note: This guide is still in the early stages of development.
Three question marks mean I have to write more on the subject. Bear with me.