The essence of education is that it is a change effected in the organism to satisfy the operator.

The pure mathematician, like the musician, is a free creator of his world of ordered beauty.

I used often to go to America during Prohibition, and there was far more drunkenness there then than before; the prohibition of pornography has much the same effect.

I am allowed to use plain English because everybody knows that I could use mathematical logic if I chose.

The very best proof that something can be done is that someone has already done it.

Some people would rather die than think.

Never try to discourage thinking, for you are sure to succeed.