When its full, sands together,
Only when its empty, doe’s it matter,
A turn of a vial, rejuvenates its style,
When full no attention doe’s it gather?

Only when its empty, doe’s it matter,

As complacent that we are,
Only when there is no more to be found,
do we contemplate an answer.

Charles Garcia

http://www.poemhunter.com/poem/life-like-an-hourglass/