Quote from : Shakespeare's Sonnets Book

Love is not love which alters it when alteration finds, or bends with the remover to remove: O no! It is an ever fixed mark that looks on tempests and is never shaken; it is the star to every wandering bark whose worth's unknown, although his height be taken. Love's not Time's fool, though rosy lips and cheeks within his bending sickle's compass come: Love alters not with his brief hours and weeks, but bears it out, even to the edge of doom."