Be of use, but don't be used.
You probably wouldn't worry about what people think of you if you could know how seldom they do.
Minds are like Parachutes. They work best when open.
When you feel like criticizing the younger generation, just remember who raised them.
When you're right, no one remembers. When you're wrong, no one forgets.
It's hard to make a program foolproof because fools are so ingenious.
A conscience doesn't prevent sin, it simply prevents you from enjoying it.
Good judgement comes from experience; and experience, well, that comes from bad judgement.
The only difference between genius and stupidity is that genius has its limits.
The harder you fall, the higher you bounce.