How we cite our quotes:
Love’s not Time’s fool, though rosy lips and cheeks
Within his bending sickle’s compass come (9-10)
Time (a.k.a. mortality) doesn’t command love, the way a king might command a court jester; instead, love is always more powerful, even though time takes its toll on physical appearance.
Love alters not with [Time’s] brief hours and weeks,
But bears it out even to the edge of doom. (11-12)
Again, the poet reiterates that the passing of time doesn’t change love, which is eternal. In comparison to the eternal nature of love, Time seems irrelevant and weak.
If this be error and upon me proved,
I never writ, nor no man ever loved. (13-14)
If we turn this statement backwards, we see that the fact that people have loved before proves that the poet’s view of love is right.