If everybody thought before they spoke, the silence would be deafening.

A great many people think they are thinking when they are merely rearranging their prejudices.

If you make people think they're thinking they'll love you: but if you really make them think, they'll hate you.

Men fear thought as they fear nothing else on earth - more than ruin, more even than death.

It's much easier to do and die than it is to reason why.

Many highly intelligent people are poor thinkers. Many people of average intelligence are skilled thinkers. The power of a car is separate from the way the car is driven.

Clear thinking requires courage rather than intelligence.

To think is to differ.

The trouble is that thinking looks like loafing. Who wants to pay people for daydreaming?

Thinking is harder work than hard work.