“A universal refusal to propagate the human species would be the greatest of conceivable crimes from a Utilitarian point of view.”

“What is liberal education,” pp. 7-8
Liberalism Ancient and Modern (1968)

Source: Guilty

The Desiring Machine
Anti-Oedipus Capitalism and Schizophrenia (1977)

From Gibbs's letter accepting the Rumford Medal (1881). Quoted in A. L. Mackay, Dictionary of Scientific Quotations (London, 1994).

Source: "Investment in human capital," 1961, p. 3

Source: The Revolt of the Masses (1929), Chapter XIV: Who Rules The World?
Context: Greeks and Latins appear in history lodged, like bees in their hives, within cities, poleis. … The polis is not primarily a collection of habitable dwellings, but a meeting-place for citizens, a space set apart for public functions. The city is not built, as is the cottage or the domus, to shelter from the weather and to propagate the species — these are personal, family concerns — but in order to discuss public affairs. … The man of the fields is still a sort of vegetable. His existence, all that he feels, thinks, wishes for, preserves the listless drowsiness in which the plant lives. The great civilisations of Asia and Africa were, from this point of view, huge anthropomorphic vegetations. …Socrates, the great townsman, quintessence of the spirit of the polis, can say: "I have nothing to do with the trees of the field, I have to do only with the man of the city." What has ever been known of this by the Hindu, the Persian, the Chinese, or the Egyptian?

Introduction
Idea for a Universal History from a Cosmopolitan Point of View (1784)
Context: Whatever concept one may hold, from a metaphysical point of view, concerning the freedom of the will, certainly its appearances, which are human actions, like every other natural event are determined by universal laws. However obscure their causes, history, which is concerned with narrating these appearances, permits us to hope that if we attend to the play of freedom of the human will in the large, we may be able to discern a regular movement in it, and that what seems complex and chaotic in the single individual may be seen from the standpoint of the human race as a whole to be a steady and progressive though slow evolution of its original endowment.

making parents and teachers a subtype of animal trainers
Source: Darwin, God and the Meaning of Life: How Evolutionary Theory Undermines Everything You Think You Know (2010), p. 155