Most teachers waste their time by asking question which are intended to discover what a pupil does not know whereas the true art of questioning has for its purpose to discover what pupils knows or is capable of knowing.

Work is the only thing I do to escape the corruption of praise.

Non-cooperation in military matters should be an essential moral principle for all true scientists.

You teach me baseball and I'll teach you relativity...No we must not. You will learn about relativity faster than I learn baseball.

Man is, at one and the same time, a solitary being and a social being.

Joy and amazement of the beauty and grandeur of this world of which man can just form a faint notion.

Each of us visits this Earth involuntarily, and without an invitation. For me, it is enough to wonder at the secrets.