Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.
Imagination is more important than knowledge.
Great spirits have always encountered violent opposition from mediocre minds.
People like us, who believe in physics, know that the distinction between past, present, and future is only a stubbornly persistent illusion.
Curiosity has its own reason for existence.
Insanity: doing the same thing over and over again and expecting different results.
Try not to become a man of success, but a man of value. Look around at how people want to get more out of life than they put in. A man of value will give more than he receives. Be creative, but make sure that what you create is not a curse for mankind.
Falling in love is not at all the most stupid thing that people do - but gravitation cannot be held responsible for it.
Science without religion is lame, religion without science is blind.
Only a life lived for others is a life worthwhile.
Weakness of attitude becomes weakness of character.
Life is like riding a bicycle. To keep your balance, you must keep moving.
Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.
I never think of the future - it comes soon enough.
It's not that I'm so smart, it's just that I stay with problems longer.
My religion consists of a humble admiration of the illimitable superior spirit who reveals himself in the slight details we are able to perceive with our frail and feeble mind.
The most incomprehensible thing about the world is that it is comprehensible.
The secret to creativity is knowing how to hide your sources.
Few people are capable of expressing with equanimity opinions which differ from the prejudices of their social environment. Most people are even incapable of forming such opinions.
Pure mathematics is, in its way, the poetry of logical ideas.