It is better to make a mistake with full force of your being than to carefully avoid mistakes with a trembling spirit.
You don't know what you don't know.
Wisdom is knowing how little we know.
A free soul ought not to pursue any study slavishly, for nothing that is learned under compulsion stays with the mind.
To know, is to know that you know nothing.
Do not grieve over someone who changes all of the sudden. It might be that he has given up acting and returned to his true self.