"You never fail until you stop trying."

"I am enough of an artist to draw freely upon my imagination. Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world."

"Life isn't worth living, unless it is lived for someone else."

"Dancers are the athletes of God."

"All religions, arts and sciences are branches of the same tree. All these aspirations are directed toward ennobling man's life, lifting it from the sphere of mere physical existence and leading the individual towards freedom." (first published 1937)]"

"The tragedy of life is what dies inside a man while he lives."

"We know from daily life that we exist for other people first of all, for whose smiles and well-being our own happiness depends."

"I speak to everyone in the same way, whether he is the garbage man or the president of the university."

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

"There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."

"No, this trick won't work... How on earth are you ever going to explain in terms of chemistry and physics so important a biological phenomenon as first love?"

"Love is a better master than duty."

"When you trip over love, it is easy to get up. But when you fall in love, it is impossible to stand again."

"Gravitation is not responsible for people falling in love."

"You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat."

"An empty stomach is not a good political adviser."

"Even on the most solemn occasions I got away without wearing socks and hid that lack of civilization in high boots"

"Student: Dr. Einstein, Aren't these the same questions as last year's [physics] final exam?Dr. Einstein: Yes; But this year the answers are different."

"I never made one of my discoveries through the process of rational thinking"

"Black holes are where God divided by zero."

"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."

"Never memorize something that you can look up."