The effective thinker treats arrogance as the major sin of thinking.

The power of a car is separate from the way the car is driven.

Once a new idea springs into existence, it cannot be unthought. There is a sense of immortality in a new idea.

Unhappiness is best defined as the difference between our talents and our expectations.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

If you do not design the future, someone or something else will design it for you.

Everyone has the right to doubt everything as often as he pleases and the duty to do it at least once. No way of looking at things is too sacred to be reconsidered. No way of doing things is beyond improvement.