William Cowper - A Comparison

The lapse of time and rivers is the same,
Both speed their journey with a restless stream;
The silent pace, with which they steal away,
No wealth can bribe, no prayers persuade to stay;
Alike irrevocable both when past,
And a wide ocean swallows both at last.
Though each resemble each in every part,
A difference strikes at length the musing heart;
Streams never flow in vain; where streams abound,
How laughs the land with various plenty crown’d!
But time, that should enrich the nobler mind,
Neglected, leaves a dreary waste behind.

William Cowper

http://www.poemhunter.com/poem/a-comparison-3/