To insult someone we call him 'bestial. For deliberate cruelty and nature, 'human' might be the greater insult.

We all know we fall. Newton's discovery was that the moon falls, too-and by the same rule that we do.

Radiation, unlike smoking, drinking, and overeating, gives no pleasure, so the possible victims object.

A fire-eater must eat fire even if he has to kindle it himself.

The essential building block is...the true love that is impossible to define for those who have never experienced it and unnecessary to define for those who have.

Science is uncertain. Theories are subject to revision; observations are open to a variety of interpretations, and scientists quarrel amongst themselves. This is disillusioning for those untrained in the scientific method, who thus turn to the rigid certainty of the Bible instead. There is something comfortable about a view that allows for no deviation and that spares you the painful necessity of having to think.

The great secret of the successful fool is that he's no fool at all