"[F]ascism owed something to the Enlightenment idea that society need not be determined by tradition, but could be organized according to a blueprint derived from universal principles. The Enlightenment thinker Jean-Jacques Rousseau's notion that society should be governed by one such universal ideal, the ‘general will’, is especially relevant, since it was taken up by the most revolutionary of the French Revolutionaries, the Jacobins. The Jacobins justified violence as a means to construct a new order and weed out those who opposed the general will (or the nation). They were ready to force people to be free."

"If we prefer to trace a lineage [of fascist ideology] within the [[Left-wing politics|[political] Left]], drawing on the Enlightenment's own perception that individual liberty can undermine community, some have gone back as far as Rousseau."

"This fact is that Rousseau who set the Western world aflame with the doctrine of equality and democracy for men also formulated and put into circulation a doctrine claiming that woman should be content to please man and get very little in return…Rousseau's doctrine that woman's duty is to please man fitted neatly, not only with Rousseau's personal egotism but also into the genteel theory respecting woman which was then spreading among the middle classes in England."

"At the present time, Hitler is an outcome of Rousseau; Roosevelt and Churchill, that of Locke."

"Liberty is the nominal goal of Rousseau's thought, but in fact it is equality that he values, and he seeks to secure even at the expense of liberty."

"It was not until after the age of Rousseau, from which must be dated the great humanitarian movement of the past century, that Vegetarianism began to assert itself as a system, a reasoned plea for the disuse of flesh-food."

"On the other hand, my basis is supported by the authority of the greatest moralist of modern times; for such, undoubtedly, J. J. Rousseau is,—that profound reader of the human heart, who drew his wisdom not from books, but from life, and intended his doctrine not for the professorial chair, but for humanity; he, the foe of all prejudice, the foster-child of nature, whom alone she endowed with the gift of being able to moralise without tediousness, because he hit the truth and stirred the heart."

"Although neither Marx nor Engels wrote much on Rousseau, the imprint of his way of thinking is unmistakable. Rousseau's politics were fundamentally anti-political and authoritarian even while he looked forward to the ultimate era of universal harmony. Not without reason he is seen as an intellectual progenitor of twentieth-century totalitarianism."

"J.-J. Rousseau, répondit-il, n'est à mes yeux qu'un sot, lorsqu'il s'avise de juger le grand monde; il ne le comprenait pas, et y portait le cœur d'un laquais parvenu... Tout en prêchant la république et le renversement des dignités monarchiques, ce parvenu est ivre de bonheur, si un duc change la direction de sa promenade après dîner, pour accompagner un de ses amis."

"[A] lucid journal of a life so utterly degraded that it has been a bestseller in France ever since."

"In Rousseau's account of the means by which equality was lost, the incoming of the ideas of property is prominent. From property arose civil society. With property came in inequality. His exposition of inequality is confused, and it is not possible always to tell whether he means inequality of possessions or of political rights."

"Kant’s moral outlook is also fundamentally determined by a subtle, shrewd, historically self-conscious (and characteristically Enlightenment) conception of human nature and human psychology that most treatments of Kantian ethics (even sympathetic ones) have largely overlooked. This side of Kant owes a great deal to Jean-Jacques Rousseau, and it belongs to a radical tradition in the social criticism of modernity whose later representatives include Johann Gottlieb Fichte and Karl Marx. The Kantian mistrust of our empirical desires reflects a Rousseauian picture of the way our natural desires have been influenced by the loss of innocence – the restless competitiveness – characteristic of human beings in the social condition, especially as found in the social inequalities of what Rousseau and Kant called the “civilized” stage of human society but was later renamed “modern bourgeois society” or “capitalism.” Again, to miss this continuity is not only to misread Kant; it is badly to misread the history, and even the living reality, of the social order that is all around us."

"I want you to read the true system of the heart, drafted by a decent man and published under another name. I do not want you to be biased against good and useful books merely because a man unworthy of reading them has the audacity to call himself the Author."

"As for the Soothsayer, although I am certain no one feels the true beauties of that work better than I, I am far from finding these beauties in the same places as the infatuated public does. They are not the products of study and knowledge, but rather are inspired by taste and sensitivity."

"Beings who are so uniquely constituted must necessarily express themselves in other ways than ordinary men. It is impossible that with souls so differently modified, they should not carry over into the expression of their feelings and ideas the stamp of those modifications."