“Society is not homogeneous, and those who do not deliberately close their eyes have to recognize that men differ greatly from one another from the physical, moral, and intellectual viewpoints.”
page 281.
Manual of Political Economy
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Vilfredo Pareto 14
Italian economist and sociologist 1848–1923Related quotes
Arthur Conan Doyle: "Sherlock Holmes" (p. 120)
More Classics Revisited (1989)

in 1985 interview https://www.youtube.com/watch?v=11AXDT5824Y with John O'Sullivan
1980s and later

Source: 1860s, Evidence as to Man's Place in Nature (1863), Ch.2, p. 95

Anarchism: Its Philosophy and Ideal (1896)
Context: All that was an element of progress in the past or an instrument of moral and intellectual improvement of the human race is due to the practice of mutual aid, to the customs that recognized the equality of men and brought them to ally, to unite, to associate for the purpose of producing and consuming, to unite for purpose of defence to federate and to recognize no other judges in fighting out their differences than the arbitrators they took from their own midst.
Each time these institutions, issued from popular genius, when it had reconquered its liberty for a moment, — each time these institutions developed in a new direction, the moral level of society, its material well-being, its liberty, its intellectual progress, and the affirmation of individual originality made a step in advance. And, on the contrary, each time that in the course of history, whether following upon a foreign conquest, or whether by developing authoritarian prejudices men become more and more divided into governors and governed, exploiters and exploited, the moral level fell, the well-being of the masses decreased in order to insure riches to a few, and the spirit of the age declined.

“All men are intellectuals: but not all men have in society the function of intellectuals.”
Source: Selections from the Prison Notebooks (1971).

Les Loix du Mouvement et du Repos, déduites d'un Principe Métaphysique (1746)

The Lost Princess of Oz (1917)
Later Oz novels
Context: Were we all like the Sawhorse, we would all be Sawhorses, which would be too many of the kind. Were we all like Hank, we would be a herd of mules; if like Toto, we would be a pack of dogs; should we all become the shape of the Woozy, he would no longer be remarkable for his unusual appearance. Finally, were you all like me, I would consider you so common that I would not care to associate with you. To be individual, my friends, to be different from others, is the only way to become distinguished from the common herd. Let us be glad, therefore, that we differ from one another in form and in disposition. Variety is the spice of life, and we are various enough to enjoy one another's society; so let us be content.