"Judge a man by his questions rather than his answers."

"He who has a why to live can bear almost any how."

"By three methods we may learn wisdom: first, by reflection, which is noblest; se..."

"The only true wisdom is in knowing you know nothing."

"The only thing I know is that I know nothing."

"We don't see things as they are, we see them as we are."

"Common sense is not so common."

"It is not that I'm so smart. But I stay with the questions much longer."