Answer: In the first quatrain Shakespeare explains the unconditional aspects of love. Love does not change when circumstances change.
In the second quatrain love is an ideal, a guide, a stronghold. When someone is lost, love shows the way.
The third quatrain illustrates the longevity of love. It endures to the end.
In the couplet, Shakespeare asserts the truth if his observations and description of love. If proven wrong, it is as if he has never written anything, and no one has ever experienced love.
Explanation:
