Sonnet 108 is one of 154 sonnets written by the English playwright and poet William Shakespeare. It's a member of the Fair Youth sequence, in which the poet expresses his love towards a young man.
Is there anything new for the poet to say about the youth? No, but he must say the same things repeatedly, like prayers, in order to keep eternal love fresh. The agedness of love disappears as it looks back to when it was first created, even though the passage of time would suggest it should by now have died.