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

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

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.

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

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

Thinking is harder work than hard work.

I like to think of thoughts as living blossoms borne by the human tree.