1. "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

2. "Without imperfection, neither you nor I would exist."

3. "Intelligence is the ability to adapt to change."

4. "The past, like the future, is indefinite and exists only as a spectrum of possibilities."

5. "Quiet people have the loudest minds."

6. "However bad life may seem, there is always something you can do and succeed at. While there is life there is hope."

7. "Work gives you meaning and purpose and life is empty without it."

8. "Remember to look up at the stars and not down at your feet."

9. "If you are lucky enough to find love, remember it is there and don't throw it away."

10. "One of the basic rules of the universe is that nothing is perfect."

11. "Life would be tragic if it weren't funny."

12. "People won't have time for you if you are always angry or complaining."

13. "People who boast about their I.Q. are losers."

14. "I'm not afraid of death, but I'm in no hurry to die. I have so much I want to do first."

15. "There is no such thing as a standard or run-of-the-mill human being..."

16. "It is no good getting furious if you get stuck."

17. "I believe things cannot make themselves impossible."

18. "My goal is simple. It is a complete understanding of the universe."

19. "Because there is a law such as gravity, the universe can and will create itself from nothing."

20. "Things can get out of a black hole both on the outside and possibly another universe. So if you feel you are in a black hole, don't give up - there's a way out."