But let us come to the philosophers, whose authority is regarded as more certain than that of the poets. Plato asserts His monarchy, saying that there is but one God, by whom the world was prepared and completed with wonderful order. Aristotle, his disciple, admits that there is one mind which presides over the world. Antisthenes says that there is one who is God by nature, the governor of the whole system. It would be a long task to recount the statements which have been made respecting the Supreme God, either by Thales, or by Pythagoras and Anaximenes before him, or afterwards by the Stoics Cleanthes and Chrysippus and Zeno, or of our countrymen, by Seneca following the Stoics, and by Tullius himself, since all these attempted to define the being of God, and affirmed that the world is ruled by Him alone, and that He is not subject to any nature, since all nature derives its origin from Him.
Source: Translated by William Fletcher. From Ante-Nicene Fathers, Vol. 7. Edited by Alexander Roberts, James Donaldson, and A. Cleveland Coxe. (Buffalo, NY: Christian Literature Publishing Co., 1886.)