There is only one road to human greatness: through the school of hard knocks.

There is, however, one other human right which is infrequently mentioned but which seems to be destined to become very important: this is the right, or the duty, of the individual to abstain from cooperating in activities which he considers wrong or pernicious.

Galileo had already made a significant beginning toward a knowledge of the law of motion. He discovered the law of inertia and the law of bodies falling freely in the gravitational field of the earth.

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

The discovery of nuclear reactions need not bring about the destruction of mankind any more than the discovery of matches.

God does not care about our mathematical difficulties. He integrates empirically.

Only a life lived for others is a life worthwhile.