"Insanity: doing the same thing over and over again and expecting different results."

"The important thing is not to stop questioning."

"Imagination is more important than knowledge."

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

"Three rules of work

1. Out of clutter, find simplicity.
2. From discord, find harmony
3. In the middle of difficulty lies opportunity."

"I never think of the future. It comes soon enough."

"Not everything that counts can be counted, and not everything that can be counted counts."

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

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

"The problems created by our level of thinking cannot be solved at our level of thinking."

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

"The eternal mystery of the world is its comprehensibility."

"The only thing that interferes with my learning is my education."

"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe."

"Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid."

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

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

"An academic career in which a person is forced to produce scientific writings in great amounts creates a danger of intellectual superficiality."

"God does not play dice"

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