Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.

Anyone who has never made a mistake has never tried anything new.

Life is like riding a bicycle. To keep your balance, you must keep moving.

If you can't explain it simply, you don't understand it well enough.

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

Coincidence is God's way of remaining anonymous.

Look deep into nature, and then you will understand everything better.

A person who never made a mistake never tried anything new.

Strive not to be a success, but rather to be of value.

Great spirits have always encountered violent opposition from mediocre minds.

Weakness of attitude becomes weakness of character.

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

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

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

I have no special talent. I am only passionately curious.

Reality is merely an illusion, albeit a very persistent one.

It's not that I'm so smart, it's just that I stay with problems longer.

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

I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.

Only a life lived for others is a life worthwhile.

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

The only source of knowledge is experience.

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

The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it.

The true sign of intelligence is not knowledge but imagination.

There are two ways to live: you can live as if nothing is a miracle; you can live as if everything is a miracle.

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

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

Once we accept our limits, we go beyond them.

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

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

You can't blame gravity for falling in love.

I live in that solitude which is painful in youth, but delicious in the years of maturity.

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

Intellectual growth should commence at birth and cease only at death.

It is the supreme art of the teacher to awaken joy in creative expression and knowledge.

The important thing is not to stop questioning. Curiosity has its own reason for existing.

The hardest thing to understand in the world is the income tax.

A table, a chair, a bowl of fruit and a violin; what else does a man need to be happy?

Nationalism is an infantile disease. It is the measles of mankind.

He who can no longer pause to wonder and stand rapt in awe, is as good as dead; his eyes are closed.

Everything should be made as simple as possible, but not simpler.

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

Education is what remains after one has forgotten what one has learned in school.

Everyone should be respected as an individual, but no one idolized.

Intellectuals solve problems, geniuses prevent them.

No amount of experimentation can ever prove me right; a single experiment can prove me wrong.

You cannot simultaneously prevent and prepare for war.

Pure mathematics is, in its way, the poetry of logical ideas.

The most beautiful thing we can experience is the mysterious. It is the source of all true art and science.

Technological progress is like an axe in the hands of a pathological criminal.

Try not to become a man of success, but rather try to become a man of value.

The monotony and solitude of a quiet life stimulates the creative mind.

I am not only a pacifist but a militant pacifist. I am willing to fight for peace. Nothing will end war unless the people themselves refuse to go to war.

The gift of fantasy has meant more to me than my talent for absorbing positive knowledge.

When you are courting a nice girl an hour seems like a second. When you sit on a red-hot cinder a second seems like an hour. That's relativity.

Memory is deceptive because it is colored by today's events.

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

Our task must be to free ourselves by widening our circle of compassion to embrace all living creatures and the whole of nature and its beauty.

All that is valuable in human society depends upon the opportunity for development accorded the individual.