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.

The Question of a Weltanschauung? (1932), in James Strachey (ed.), The Standard Edition of the Complete Psychological Works of Sigmund Freud (1964), vol. 22