Maturity begins when we're content to feel we're right about something without feeling the necessity to prove someone else wrong.

Nothing is as easy to make as a promise this winter to do something next summer; this is how commencement speakers are caught.

Good teaching must be slow enough so that it is not confusing, and fast enough so that it is not boring.

"Terrorism" is what we call the violence of the weak, and we condemn it; "war" is what we call the violence of the strong, and we glorify it.

The paradox of friendship is that it is both the strongest thing in the world and the most fragile. Wild horses cannot separate friends, but whining words can. A man will lay down his life for his friend but will not sacrifice his eardrums.

The commonest fallacy among women is that simply having children makes them a mother - which is as absurd as believing that having a piano makes one a musician.

Parents - and teachers too - are woefully short-sighted when they try to protect the child from his mistakes, when they make the "right answer" more important than the quest for knowledge and good judgment. For what is not learned within one's self cannot be learned from another.