The endeavor to obtain a knowledge of divine and human things was in Greece slowly and with difficulty evolved from their religious notions, and it was for a long time confined to the refining and rationalizing of their mythology. An extensive Orphic literature first appeared at the time of the Persian war, when the remains of the Pythagorean order in Magna Graecia united themselves to the Orphic associations. The philosophy of Pythagoras, however, had no analogy with the spirit of the Orphic mysteries, in which the worship of Dionysus was the centre of all religious ideas, while the Pythagorean philosophers preferred the worship of Apollo and the Muses. In the Orphic theogony we find, for the first time, the idea of creation. Another difference between the notions of the Orphic poets and those of the early Greeks was that the former did not limit their views to the present state of mankind, still less did they acquiesce in Hesiod's melancholy doctrine of successive ages, each one worse than the preceding; but they looked for a cessation of strife, a state of happiness and beatitude at the end of all things. Their hopes of this result were founded on Dionysus, from the worship of whom all their peculiar religious ideas were derived. This god, the son of Zeus, is to succeed him in the government of the world, to restore the Golden Age, and to liberate human souls, who, according to an Orphic notion, are punished by being confined in the body as in a prison. The sufferings of the soul in its prison, the steps and transitions by which it passes to a higher state of existence, and its gradual purification and enlightenment, were all fully described in these poems. Thus, in the poetry of the first five centuries of Greek literature, especially at the close of this period, we find, instead of the calm enjoyment of outward nature which characterized the early epic poetry, a profound sense of the misery of human life, and an ardent longing for a condition of greater happiness. This feeling, indeed, was not so extended as to become common to the whole Greek nation, but it took deep root in individual minds, and was connected with more serious and spiritual views of human nature.