The first human who hurled an insult instead of a stone was the founder of civilization.

Religious illusion must bow to scientific truth. It is in total error about the nature of the true world. Only science is not an illusion.

The idea of men's receiving an intimation of their connection with the world around them through an immediate feeling which is from the outset directed to that purpose sounds so strange and fits in so badly with the fabric of our psychology that one is justified in attempting to discover a psycho-analytic - that is, a genetic - explanation of such a feeling.

"He sido un hombre afortunado en la vida, nada me ha sido facil." "I've been a fortunate man in life, nothing has come easy"

A man's heterosexuality will not put up with any homosexuality, and vice versa.

The reproaches against science for not having yet solved the problems of the universe are exaggerated in an unjust and malicious manner; it has truly not had time enough yet for these great achievements. Science is very young--a human activity which developed late.

Taboo restrictions are distinct from religious or moral prohibitions. They are not based upon any divine ordinance, but may be said to impose themselves on their own account. They differ from moral prohibitions in that they fall into no system that declares quite generally that certain abstinences must be observed and gives reasons for that necessity.