"We are what we repeatedly do. Excellence, then, is not an act, but a habit"
"Opinion is the medium between knowledge and ignorance"
"Judge a man by his questions, not by his answers."
"The pleasure of finding things out."
"Don't you have time to think?"
"The roots of education are bitter, but the fruit is sweet"
"It's not that I am so smart. But I stay with the questions much longer."
"I would trade all my technology for an afternoon with Socrates"
"It is the mark of an educated man to be able to entertain a thought without accepting it"
"We cannot solve our problems with the same thinking we used when we created them."
"Nothing exists except atoms and empty space. Everything else is opinion. "
"The first principle is that you must not fool yourself. And you are the easiest person to fool. "
"I would rather have questions that can't be answered than answers that can't be questioned"
"I learned very early the difference between knowing the name of something and knowing something."
"Any fool can know. The point is to understand."
"The unexamined life is not worth living"