Humanistic ethics is based on the principle that only humans themselves can determine the criterion for virtue and not an authority transcending us.

The most essential characteristic of scientific technique is that it proceeds from experiment, not from tradition. The experimental habit of mind is a difficult one for most people to maintain; indeed, the science of one generation has already become the tradition of the next

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.

Have no respect for the authority of others, for there are always contrary authorities to be found

An extra-terrestrial philosopher, who had watched a single youth up to the age of twenty-one and had never come across any other human being, might conclude that it is the nature of human beings to grow continually taller and wiser in an indefinite progress towards perfection; and this generalization would be just as well founded as the generalization which evolutionists base upon the previous history of this planet.

[Industrialism's soon diminishing] capacity to supply human needs could be prevented if men exercised any restraint or foresight in their present frenzied exploitation.

Worry is a form of fear.