It is strange to be known so universally and yet to be so lonely.
There are two ways to live: you can live as if nothing is a miracle; you can live as if everything is a miracle.
The true sign of intelligence is not knowledge but imagination.
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.
The difference between stupidity and genius is that genius has its limits.
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.
We cannot solve our problems with the same thinking we used when we created them.
It has become appallingly obvious that our technology has exceeded our humanity.
The only thing that interferes with my learning is my education.
It is a miracle that curiosity survives formal education.
If you can't explain it simply, you don't understand it well enough.
The monotony and solitude of a quiet life stimulates the creative mind.
The value of a man should be seen in what he gives and not in what he is able to receive.
The only source of knowledge is experience.
Anyone who doesn't take truth seriously in small matters cannot be trusted in large ones either.
Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.
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.
Logic will get you from A to B. Imagination will take you everywhere.
Imagination is everything. It is the preview of life's coming attractions.
A question that sometimes drives me hazy: am I or are the others crazy?
If we knew what it was we were doing, it would not be called research, would it?
The most incomprehensible thing about the world is that it is comprehensible.
Most of the fundamental ideas of science are essentially simple, and may, as a rule, be expressed in a language comprehensible to everyone.
The pursuit of truth and beauty is a sphere of activity in which we are permitted to remain children all our lives.
There comes a time when the mind takes a higher plane of knowledge but can never prove how it got there.
When the solution is simple, God is answering.
That deep emotional conviction of the presence of a superior reasoning power, which is revealed in the incomprehensible universe, forms my idea of God.
Great spirits have always encountered violent opposition from mediocre minds.
Anyone who has never made a mistake has never tried anything new.
The important thing is not to stop questioning. Curiosity has its own reason for existing.
Once we accept our limits, we go beyond them.
I live in that solitude which is painful in youth, but delicious in the years of maturity.
I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.
A man should look for what is, and not for what he thinks should be.
Only one who devotes himself to a cause with his whole strength and soul can be a true master. For this reason mastery demands all of a person.