What are the various figures of speech used in Shakespeare's "Sonnet 116"?
The sonnet is a veritable feast of metaphors! Shakespeare compares love to symbols of constancy:
"an ever fixed mark" - love is permanent and cannot be changed or removed.
"star" - a guide to follow, to avoid becoming lost.
It also uses personification, saying that even as love ages (as a person does), it does not change. Love will even last beyond death.