Pause here, and think; a monitory rhyme
Demands one moment of thy fleeting time.
Consult life's silent clock, thy bounding vein;
Seems it to say --'Health here has long to reign?'
Hast thou the vigour of thy youth? an eye
That beams delight? a heart untaught to sigh?
Yet fear! Youth ofttimes healthful and at ease,
Anticipates a day it never sees;
And many a tomb, like Hamilton's, aloud
Exclaims, 'Prepare thee for an early shroud!'

William Cowper

http://www.poemhunter.com/poem/inscription-for-the-tomb-of-mr-hamilton/