This intimate union of erudition and faith continued {33} in the Latin world. Theology became more and more a process of deification of the principles or agents discovered by science and a worship of time regarded as the first cause, the stars whose course determined the events of this world, the four elements whose innumerable combinations produced the natural phenomena, and especially the sun which preserved heat, fertility and life. The dogmas of the mysteries of Mithra were, to a certain extent, the religious expression of Roman physics and astronomy. In all forms of pantheism the knowledge of nature appears to be inseparable from that of God.[15] Art itself complied more and more with the tendency to express erudite ideas by subtle symbolism, and it represented in allegorical figures the relations of divine powers and cosmic forces, like the sky, the earth, the ocean, the planets, the constellations and the winds. The sculptors engraved on stone everything man thought and taught. In a general way the belief prevailed that redemption and salvation depended on the revelation of certain truths, on a knowledge of the gods, of the world and of our person, and piety became gnosis.[16] But, you will say, since in the classic age philosophy also claimed to lead to morality through instruction and to acquaint man with the supreme good, why did it yield to Oriental religions that were in reality neither original nor innovating? Quite right, and if a powerful rationalist school, possessed of a good critical method, had led the minds, we may believe that it would have checked the invasion of the barbarian mysteries or at least limited their field of action. However, as has frequently been pointed out, even in ancient Greece the philosophic critics had very little hold on {34} popular religion obstinately faithful to its inherited superstitious forms. But how many second century minds shared Lucian's skepticism in regard to the dogmatic systems! The various sects were fighting each other for ever so long without convincing one another of their alleged error. The satirist of Samosata enjoyed opposing their exclusive pretensions while he himself reclined on the "soft pillow of doubt." But only intelligent minds could delight in doubt or surrender to it; the masses wanted certainties. There was nothing to revive confidence in the power of a decrepit and threadbare science. No great discovery transformed the conception of the universe. Nature no longer betrayed her secrets, the earth remained unexplored and the past inscrutable. Every branch of knowledge was forgotten. The world cursed with sterility, could but repeat itself; it had the poignant appreciation of its own decay and impotence. Tired of fruitless researches, the mind surrendered to the necessity of believing. Since the intellect was unable to formulate a consistent rule of life faith alone could supply it, and the multitudes gravitated toward the temples, where the truths taught