Answer by
lonelywolf (2117)
There are two contenders for this title, but they are a little overused. The first is Shakespeare's Sonnet #18 ("Shall I compare thee to a summer's day") and Elizabeth Barrett Browning's "Sonnets from the Portuguese" #43 ("How do I love thee? Let me count the ways"). "I Thought of You" by Sara Teasdale is a little more unusual but excellent.