A common mistake people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.

Trying is a part of failing. If you are afraid to fail then you're afraid to try.

Trying to determine what is going on in the world by reading newspapers is like trying to tell the time by watching the second hand of a clock.

If at first you don't succeed, try, try, try again.

People are always neglecting something they can do in trying to do something they can't do.

When one is trying to do something beyond his known powers it is useless to seek the approval of friends. Friends are at their best in moments of defeat.

Trying is the internalization of the failure of omnipotence.

Try not. Do, or do not. There is no try.