I can calculate the motion of heavenly bodies, but not the madness of people.

You speak an infinite deal of nothing.

There are two levers for moving men, interest and fear.

Sometimes you put walls up not to keep people out, but to see who cares enough to break them down.

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.

External nature is only internal nature writ large.