"The fact is that philosophy has been a decisive source of inspiration in all the great crises that Europe has faced. It has been so in the time that preceded the fall of the Roman Empire, when Augustine of Hippo delineated the features of a new spiritual civilization; in the age of religious wars, when Descartes and Hobbes established the principles of modern science and politics; and at the turn of the French Revolution, interpreted by Kant and Hegel as an event destined to change the history of the world."

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People are mostly sane enough, of course, in the affairs of common life: the getting of food, shelter, and so on. But the moment they attempt any depth or generality of thought, they go mad almost infallibly. The vast majority, of course, adopt the local religious madness, as naturally as they adopt the local dress. But the more powerful minds will, equally infallibly, fall into the worship of some intelligent and dangerous lunatic, such as Plato, or Augustine, or Comte, or Hegel, or Marx.

— David Stove