XV. (68) The aforesaid emigrations, if one is to be guided by the literal expressions of the scripture, were performed by a wise man; but if we look to the laws of allegory, by a soul devoted to virtue and busied in the search after the true God. (69) For the Chaldaeans were, above all nations, addicted to the study of astronomy, and attributed all events to the motions of the stars, by which they fancied that all the things in the world were regulated, and accordingly they magnified the visible essence by the powers which numbers and the analogies of numbers contain, taking no account of the invisible essence appreciable only by the intellect. But while they were busied in investigating the arrangement existing in them with reference to the periodical revolutions of the sun, and moon, and the other planets, and fixed-stars, and the changes of the seasons of the year, and the sympathy of the heavenly bodies with the things of the earth, they were led to imagine that the world itself was God, in their impious philosophy comparing the creature to the Creator. (70) The man who had been bred up in this doctrine, and who for a long time had studied the philosophy of the Chaldaeans, as if suddenly awakening from a deep slumber and opening the eye of the soul, and beginning to perceive a pure ray of light instead of profound darkness, followed the light, and saw what he had never see before, a certain governor and director of the world standing above it, and guiding his own work in a salutary manner, and exerting his care and power in behalf of all those parts of it which are worthy of divine superintendence. (71) In order, therefore, that he may the more firmly establish the sight which has thus been presented to him in his mind, the sacred word says to him, My good friend, great things are often made known by slight outlines, at which he who looks increases his imagination to an unlimited extent; therefore, having dismissed those who bend all their attention to the heavenly bodies, and discarding the Chaldaean science, rise up and depart for a short time from the greatest of cities, this world, to one which is smaller; for so you will be the better able to comprehend the nature of the Ruler of the universe. (72) It is for this reason that Abraham is said to have made this first migration from the country of the Chaldaeans into the land of Charran.