Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.

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

Mathematics, rightly viewed, possesses not only truth, but supreme beauty - a beauty cold and austere, like that of a sculpture, without appeal to any part of our weaker nature, without the gorgeous trappings of painting or music, yet sublimely pure, and capable of a stern perfection such as only the greatest art can show.\n>Bertrand Russell Three passions, simple but overwhelmingly strong, have governed my life: the longing for love, the search for knowledge, and unbearable pity for the suffering of mankind.

Mathematics takes us still further from what is human, into the region of absolute necessity, to which not only the actual world, but every possible world, must conform.

It is undesirable to believe a proposition when there is no ground whatever for supposing it to be true.

Fear is the main source of superstition, and one of the main sources of cruelty. To conquer fear is the beginning of wisdom.