A lot of people mistake a short memory for a clear conscience.

Do not fear to be eccentric in opinion, for every opinion now accepted was once eccentric.

Science is facts; just as houses are made of stones, so is science made of facts; but a pile of stones is not a house and a collection of facts is not necessarily science.

Only exceptionally rational men can afford to be absurd.

The average person thinks he isn't.

It has always been the prerogative of children and half-wits to point out that the emperor has no clothes. But the half-wit remains a half-wit, and the emperor remains an emperor.