Science is simply common sense at its best—that is, rigidly accurate in observation, and merciless to fallacy in logic.  

You will never be happy if you continue to search for what happiness consists of. You will never live if you are looking for the meaning of life.

I don’t know what art is, but I know what it does.

If knowledge can create problems, it is not through ignorance that we can solve them.

I don't want to be remembered as a movie star. I want to be remembered as a good man who tried to make a difference.