找一篇简短且富有哲理的英语短文。

but as the care-worn cheets grow wan,
and sorrow's shafts fly thicker,
ye stars, that measure life to man,
why seem your courses quicker?
when joys have lost their bloom and breath
and life itself is vapid,
why, as we reach the falls of death,
feel we its tide more rapid?
it may be strange-yet who would change
time's coures to slower speeding,
when one by one our friends have gone
and left our bosoms bleeding?
heaven gives our years of fading strength
indemnifying fleetness;
and those of youth,a seeming length,
proportion'd their sweetness.