The young think about how they'll change the world, the old think about how the world has changed.

The fastest way to lose an argument is to lose your temper.

If only people fought undeserved praise as much as they do unfair criticism.

The young think about how they'll change the world, the old think about how the world has changed.

In all human affairs, the wisest course is to be passionate about the role of reason and reasonable about the role of passion.

When we successfully deceive others, they are not aware of it; the same is true with self-deception.

Throughout history, most of the wrongs of the world have resulted from people absolutely sure they were in the right.