On the Life of the Wise Man made perfect by Instruction or, on the Unwritten Law, that is to say, on Abraham (275)

Thus much is sufficient to say on this subject. But God, adding to the multitude and magnitude of the praises of the wise man one single thing as a crowning point, says that "this man fulfilled the divine law, and all the commandments of God," [*] not having been taught to do so by written books, but in accordance with the unwritten law of his nature, being anxious to obey all healthful and salutary impulses. And what is the duty of man except most firmly to believe those things which God asserts?