In teaching it is the method and not the content that is the message.

Stand still, close your eyes and listen; in the silence you can hear the cries of pain and low moans of anguish of animals waiting to die... do everything you can even if today it is just one small thing. There are no excuses for inaction, despair, egotism, or petulance that matter to the animals.

Children are the most learning-hungry beings in the world.

Hell has been described as a pocket edition of Chicago.

Scientists do not believe in fundamental and absolute certainties. For the scientist, certainty is never an end, but a search; not the ordering of certainty, but its exploration. For the scientist, certainty represents the highest degree of probability.

It is work, work that one delights in, that is the surest guarantor of happiness. But even here it is a work that has to be earned by labor in one's earlier years. One should labor so hard in youth that everything one does subsequently is easy by comparison.

The basic fact is simple: life begins not at birth, but conception.