Nine-tenths of the appeal of pornography is due to the indecent feelings concerning sex which moralists inculcate in the young; the other tenth is physiological, and will occur in one way or another whatever the state of the law may be.

What the world needs is not dogma but an attitude of scientific inquiry combined with a belief that the torture of millions is not desirable, whether inflicted by Stalin or by a Deity imagined in the likeness of the believer

Human nature is so constructed that it gives affection most readily to those who seem least to demand it.

The resistance to a new idea increases by the square of its importance.

We are faced with the paradoxical fact that education has become one of the chief obstacles to intelligence and freedom of thought.

Almost everything that distinguishes the modern world from earlier centuries is attributable to science, which achieved its most spectacular triumphs in the seventeenth century.

Machines have altered our way of life, but not our instincts. Consequently, there is maladjustment.