Collective fear stimulates herd instinct, and tends to produce ferocity toward those who are not regarded as members of the herd.

Civilized people cannot fully satisfy their sexual instinct without love

By self-interest, Man has become gregarious, but in instinct he has remained to a great extent solitary; hence the need of religion and morality to reinforce self-interest

Conquer the world by intelligence, and not merely by being slavishly subdued by the terror that comes from it.

Fear is the main source of superstition, and one of the main sources of cruelty. To conquer fear is the beginning of wisdom, in the pursuit of truth as in the endeavour after a worthy manner of life.

Those who have never known the deep intimacy and the intense companionship of mutual love have missed the best thing that life has to give.