The man of science is a poor philosopher.

Morality is of the highest importance – but for us, not for God.

As far as I’m concerned, I prefer silent vice to ostentatious virtue.

Never do anything against conscience even if the state demands it.

Nothing is more destructive of respect for the government and the law of the land than passing laws which cannot be enforced.

An empty stomach is not a good political adviser.

The only real valuable thing is intuition.

Small is the number of people who see with their eyes and think with their minds.

If I were not a physicist, I would probably be a musician. I often think in music. I live my daydreams in music. I see my life in terms of music.

Sometimes one pays most for the things one gets for nothing.

To the Master’s honor all must turn, each in its track, without a sound, forever tracing Newton’s ground.

One may say the eternal mystery of the world is its comprehensibility.

God may be subtle, but he isn’t plain mean.

It was the experience of mystery – even if mixed with fear – that engendered religion.

The grand aim of all science is to cover the greatest number of empirical facts by logical deduction from the smallest number of hypotheses or axioms.

Occurrences in this domain are beyond the reach of exact prediction because of the variety of factors in operation, not because of any lack of order in nature.

Isn’t it strange that I who have written only unpopular books should be such a popular fellow?

Never lose a holy curiosity.

The attempt to combine wisdom and power has only rarely been successful and then only for a short while.

Reading, after a certain age, diverts the mind too much from its creative pursuits. Any man who reads too much and uses his own brain too little falls into lazy habits of thinking.