Greek art, when we first catch sight of it, is entangled with Greek religion. We are accustomed to think of Greek religion as the religion of art and beauty, the religion of which the Olympian Zeus and the Athena Polias are the idols, the poems of Homer the sacred books. Thus Cardinal Newman speaks of "the classical polytheism which was gay and graceful, as was natural in a civilised age." Yet such a view is only a partial one. In it the eye is fixed on the sharp, bright edge of high Hellenic culture, but loses sight of the sombre world across which it strikes. Greek religion, where we can observe it most distinctly, is at once a magnificent ritualistic system, and a cycle of poetical conceptions. Religions, as they grow by natural laws out of man's life, are modified by whatever modifies his life. They brighten under a bright sky, they become liberal as the social range widens, they grow intense and shrill in the clefts of human life, where the spirit is narrow and confined, and the stars are visible at noonday; and a fine analysis of these differences is one of the gravest functions of religious criticism. Still, the broad foundation, in mere human nature, of all religions as they exist for the greatest number, [201] is a universal pagan sentiment, a paganism which existed before the Greek religion, and has lingered far onward into the Christian world, ineradicable, like some persistent vegetable growth, because its seed is an element of the very soil out of which it springs.