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.

In a sense, words are encyclopedias of ignorance because they freeze perceptions at one moment in history and then insist we continue to use these frozen perceptions when we should be doing better.

(...) being right all the time acquires a huge importance in education, and there is this terror of being wrong. The ego is so tied to being right that later on in life you are reluctant to accept that you are ever wrong, because you are defending not the idea but your self-esteem. (...) this terror of being wrong means that people have enormous difficulties in changing ideas.

The image that concerns most people is the reflection they see in other people's minds.

The solid wealth of insurance companies and the success of those who organsie gambling are some indication of the profits to be derived from the efficient use of chance.

If you never change your mind, why have one?

Humor is by far the most significant activity of the human brain.