Where light and darkness in perpetual round
Lodge and dislodge by turns, which makes through heaven
Grateful vicissitude, like day and night:
Light issues forth, and at the other door
Obsequious darkness enters, till her hour
To veil the heaven.
[219] Sleep, Death’s half brother.] Virg. Æn. vi. 278:
Here Toils and Death, and Death’s half-brother Sleep,
Forms terrible to view, their sentry keep.
Dryden.