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