Insanity: doing the same thing over and over again and expecting different results.

Logic will get you from A to B. Imagination will take you everywhere.

The secret to creativity is knowing how to hide your sources.

It should be possible to explain the laws of physics to a barmaid.

The only source of knowledge is experience.

I never think of the future - it comes soon enough.

Any man who reads too much and uses his own brain too little falls into lazy habits of thinking.

Before God we are all equally wise - and equally foolish.

You can never solve a problem on the level on which it was created.

Intellectuals solve problems, geniuses prevent them.

Peace cannot be kept by force; it can only be achieved by understanding.

We can't solve problems by using the same kind of thinking we used when we created them.

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

An empty stomach is not a good political adviser.

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

Joy in looking and comprehending is nature's most beautiful gift.

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

Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

No problem can be solved from the same level of consciousness that created it.

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

Things should be made as simple as possible, but not any simpler.

The unleashed power of the atom has changed everything save our modes of thinking and we thus drift toward unparalleled catastrophe.

The difference between stupidity and genius is that genius has its limits.

The only reason for time is so that everything doesn't happen at once.

Concern for man and his fate must always form the chief interest of all technical endeavors. Never forget this in the midst of your diagrams and equations.

The most incomprehensible thing about the world is that it is comprehensible.

Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.

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

Gravitation is not responsible for people falling in love.

The release of atomic energy has not created a new problem. It has merely made more urgent the necessity of solving an existing one.

I am a deeply religious nonbeliever - this is a somewhat new kind of religion.

The value of a man should be seen in what he gives and not in what he is able to receive.

Whoever is careless with the truth in small matters cannot be trusted with important matters.

We cannot solve our problems with the same thinking we used when we created them.

You cannot simultaneously prevent and prepare for war.

We cannot despair of humanity, since we ourselves are human beings.

There comes a time when the mind takes a higher plane of knowledge but can never prove how it got there.

Not everything that can be counted counts, and not everything that counts can be counted.

The whole of science is nothing more than a refinement of everyday thinking.

Common sense is the collection of prejudices acquired by age eighteen.

Any man who can drive safely while kissing a pretty girl is simply not giving the kiss the attention it deserves.

If you are out to describe the truth, leave elegance to the tailor.

Imagination is everything. It is the preview of life's coming attractions.

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.

If we knew what it was we were doing, it would not be called research, would it?

If the facts don't fit the theory, change the facts.

Never lose a holy curiosity.

To raise new questions, new possibilities, to regard old problems from a new angle, requires creative imagination and marks real advance in science.

Anger dwells only in the bosom of fools.