All exact science is dominated by the idea of approximation.

Logic must no more admit a unicorn than zoology can.

I do not think any reasonable person can doubt that in India, China and Japan, if the knowledge of birth control existed, the birthrate would fall very rapidly

If everything has a cause, then God must have a cause. If there can be anything without a cause, it may just be the world as God.

Our individual life is brief, and perhaps the whole life of mankind will be brief if measured in astronomical scale

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.

Moral indignation is one of the most harmful forces in the modern world, the more so as it can always be diverted to sinister uses by those who control propaganda.