There are beds and tables in the world - plenty of them, are there not? But there are only two ideas or forms of them - one the idea of a bed, the other of a table.

The more I know, the more I know that I don't know.

The perfect human being is all human beings put together, it is a collective, it is all of us together that make perfection.

The only true wisdom is in knowing you know nothing.

Be the kind of person that you want people to think you are.

One should never do wrong in return, nor mistreat any man, no matter how one has been mistreated by him.

Are you not ashamed of heaping up the greatest amount of money and honor and reputation, and caring so little about wisdom and truth and the greatest improvement of the soul?