1. “Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.”

2. “A person who never made a mistake never tried anything new.”

3. “We cannot solve our problems with the same thinking we used when we created them.”

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

5. “Two things are infinite: the universe and human stupidity; and I’m not sure about the universe.”

6. “Life is like riding a bicycle. To keep your balance, you must keep moving.”

7. “In the middle of difficulty lies opportunity.”

8. “Education is not the learning of facts, but the training of the mind to think.”

9. “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.”

10. “Great spirits have always encountered violent opposition from mediocre minds.”

11. “If you can’t explain it simply, you don’t understand it well enough.”

12. “The only source of knowledge is experience.”

13. “Science without religion is lame, religion without science is blind.”

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

15. “Insanity is doing the same thing over and over again and expecting different results.”

16. “The true sign of intelligence is not knowledge but imagination.”

17. “Not everything that can be counted counts, and not everything that counts can be counted.”

18. “Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.”

19. “It’s not that I’m so smart, it’s just that I stay with problems longer.”

20. “Strive not to be a success, but rather to be of value.”