William Shakespeare - Carpe Diem

O mistress mine, where are you roaming?
O stay and hear! your true-love's coming
That can sing both high and low;
Trip no further, pretty sweeting,
Journey's end in lovers' meeting--
Every wise man's son doth know.

What is love? 'tis not hereafter;
Present mirth hath present laughter;
What's to come is still unsure:
In delay there lies no plenty,--
Then come kiss me, Sweet and twenty,
Youth's a stuff will not endure.

William Shakespeare

http://www.poemhunter.com/poem/carpe-diem/