May I do to others as I would that they should do unto me.

The wise man will want to be ever with him who is better than himself.

Enjoy life. There's plenty of time to be dead. Be kind, for everyone you meet is fighting a harder battle.

He is unworthy of the name of man who is ignorant of the fact that the diagonal of a square is incommensurable with its side.

Someday, in the distant future, our grand-children' s grand-children will develop a new equivalent of our classrooms. They will spend many hours in front of boxes with fires glowing within. May they have the wisdom to know the difference between light and knowledge.

The object of knowledge is what exists and its function to know about reality.

Courage is a kind of salvation.