Instruction in sex is as important as instruction in food; yet not only are our adolescents not taught the physiology of sex, but never warned that the strongest sexual attraction may exist between persons so incompatible in tastes and capacities that they could not endure living together for a week much less a lifetime.

Stop being Jews and start being human beings.

My friend, when a man has anything to tell in this world, the difficulty is not to make him tell it, but to prevent him from telling it too often.

[...] any fool can make a discovery. Every baby has to discover more in the first years of its life than Roger Bacon ever discovered in his laboratory.

Compassion is the fellow-feeling of the unsound.

Treat a friend as a person who may someday become your enemy; an enemy as a person who may someday become your friend.

To a professional critic (I have been one myself) theatre-going is the curse of Adam. The play is the evil he is paid to endure in the sweat of his brow; and the sooner it is over, the better.