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Fortunately exact science and the books of the learned are not necessary to establish my essential doctrine, nor can any of them claim a higher warrant than it has in itself: for it rests on public experience. It needs, to prove it, only the stars, the seasons, the swarm of animals, the spectacle of birth and death, of cities and wars. My philosophy is justified, and has been justified in all ages and countries, by the facts before every man’s eyes; and no great wit is requisite to discover it, only (what is rarer than wit) candour and courage. Learning does not liberate men from superstition when their souls are cowed or perplexed ; and, without learning, clear eyes and honest reflection can discern the hang of the world, and distinguish the edge of truth from the might of imagination. In the past or in the future, my language and my borrowed knowledge would have been different, but under whatever sky I had been born, since it is the same sky, I should have had the same philosophy.