There may be no good reasons for very many opinions that are held with passion.

Much of the most important evils that mankind have to consider are those which they inflict upon each other through stupidity or malevolence or both.

The Church no longer contends that knowledge is in itself sinful, though it did so in its palmy days; but the acquisition of knowledge, even though not sinful, is dangerous, since it may lead to pride of intellect, and hence to a questioning of the Christian dogma.

The fundamental concept in social science is Power, in the same sense in which Energy is the fundamental concept in physics.

Fundamental happiness depends more than anything else upon what may be called a friendly interest in persons and things.

A stupid man's report of what a clever man says can never be accurate, because he unconsciously translates what he hears into something he can understand.

The psychology of adultery has been falsified by conventional morals, which assume, in monogamous countries, that attraction to one person cannot coexist with affection for another. Everybody knows that this is untrue.