The mind that opens to a new idea never returns to its original size

Weakness of attitude becomes weakness of character.

You have to learn the rules of the game. And then you have to play better than anyone else.

The most valuable thing a teacher can impart to children is not knowledge and understanding per se but a longing for knowledge and understanding, and an appreciation for intellectual values, whether they be artistic, scientific, or moral. It is the supreme art of the teacher to awaken joy in creative expression and knowledge. Most teachers waste their time by asking questions that are intended to discover what a pupil does not know, whereas the true art of questioning is to discover what the pupil does know or is capable of knowing.

Those who believe that politics and religion do not mix, understand neither.

Qualities I sought in a scientific theory were naturalness, inner perfection and logical simplicity from an aesthetic approach.

The most precious things in life are not those you get for money.