There is as much greatness of mind in acknowledging a good turn, as in doing it.

A fast way to demolish relationships, shatter credibility and disrespect yourself is by not following through when you say you are going to do something.

However many holy words you read, However many you speak, What good will they do you If you do not act on upon them?

I have always believed, and I still believe, that whatever good or bad fortune may come our way we can always give it meaning and transform it into something of value.

The world is a comedy to those that think, and a tragedy to those that feel.

When we are tired, we are attacked by ideas we conquered long ago.

When I examine myself and my methods of thought, I come to the conclusion that the gift of fantasy has meant more to me than my talent for absorbing positive knowledge.

Only when we realize that there is no eternal, unchanging truth or absolute truth can we arouse in ourselves a sense of intellectual responsibility.

Ignorance never settle a question.

No amount of evidence will ever persuade an idiot.

I frame no hypotheses; for whatever is not deduced from the phenomena is to be called an hypothesis; and hypotheses, whether metaphysical or physical, whether of occult qualities or mechanical, have no place in experimental philosophy.