he explains, is the polar star on the path of life, and the invention of crimes, punishments, and remorse will only obscure it. “In founding morality on the relationships which must always exist between men, the religious law becomes perhaps superfluous; and the civil law should only be the enunciation of the law of nature, which we bear engraved on our hearts, and which must always be the strongest.” At the end Diderot intervenes with a counsel of moderation and practical wisdom: “What shall we do, then? We will protest against foolish laws until they are reformed: meanwhile we will submit. He who by his private authority breaks a bad law, authorizes others to break good laws. There is less inconvenience in being mad with the mad than in being wise by oneself. Let us say to ourselves, let us proclaim incessantly, that shame, punishment, and ignominy have been attached to actions which in themselves are innocent. But do not let us commit them; for shame, punishment, and ignominy are themselves the worst of evils.” “Every century has its own spirit; that of ours seems to be liberty.” So in 1776, when men were beginning to say that it was time to burn philosophers instead of their books, and a boy of eighteen was actually burned, Diderot wrote to Voltaire, in the famous letter in which he announced that in spite of all he would stay in Paris, among the enemies of liberty, to carry on his own mission. Timidity in political matters was excusable in Diderot’s day, and existed even among the men of his own set. Helvetius, for instance, advocated the advantages of paternal government and benevolent despotism; with his usual keen and vigorous good sense, Diderot shows how unreal these advantages are. When we give a ruler absolute power to do good, we cannot prevent him assuming also an absolute power to do evil. Moreover, as Diderot insisted, it is not possible to make people good against their wills, nor is it desirable to treat men like sheep. “If they say, ‘We are well enough here,’ or if, even, they say, ‘We are not well here, but we will stay,’ let us try to enlighten them, to undeceive them, to bring them to saner views by persuasion, but never by force.” “The arbitrary government of a just and enlightened prince is always bad.” He insists, again and again, that we must never let our pretended masters do good to us against our wills. “Whenever you see the sovereign authority in a country extending beyond the region of police, you may say that that country is badly governed.” Diderot, Goethe, Adam Smith, Beccaria, Mill, to mention but a few typical names, threw all the weight of their influence, sometimes with passionate emphasis, on the side of individuality and freedom, and their teaching reached its final consecration when Darwin accepted as his central theory the fruitful idea of Malthus. They felt, and rightly felt, that they were taking the step that was most needed. Those who advocated solidarity and