At thirty, man suspects himself a fool,
Knows it at forty, and reforms his plan;
At fifty, chides his infamous delay,
Pushes his prudent purpose to resolve,
In all the magnanimity of thought;
Resolves, and re-resolves, then dies the same.
And why? because he thinks himself immortal,
All men think all men mortal but themselves.
Author: Edward Young
Source: Night Thoughts (night I, l. 417)