No reason can be given for the nature of God, because that nature is the ground of rationality.

Almost all new ideas have a certain aspect of foolishness when they are first produced.

The main importance of Francis Bacon's influence does not lie in any peculiar theory of inductive reasoning which he happened to express, but in the revolt against second-hand information of which he was a leader.

Civilization advances by extending the number of important operations which we can perform without thinking of them.

I am sure that one secret of a successful teacher is that he has formulated quite clearly in his mind what the pupil has got to know in precise fashion. He will then cease from half-hearted attempts to worry his pupils with memorizing a lot of irrelevant stuff of inferior importance.

Every really new idea looks crazy at first.

The great achievements of the past were the adventures of the past. Only the adventurous can understand the greatness of the past.