The distinction between the past, present and future is only a stubbornly persistent illusion.

A question that sometimes drives me hazy: am I or are the others crazy?

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

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

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

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

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

True religion is real living; living with all one's soul, with all one's goodness and righteousness.

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

Once we accept our limits, we go beyond them.

If people are good only because they fear punishment, and hope for reward, then we are a sorry lot indeed.

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

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

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

You can't blame gravity for falling in love.

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

The true sign of intelligence is not knowledge but imagination.

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

The only source of knowledge is experience.

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

Only a life lived for others is a life worthwhile.

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

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

Weakness of attitude becomes weakness of character.

The environment is everything that isn't me.

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.

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

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

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

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