XIII. (60) Let thus much, then, be said generally about the three persons, since it was absolutely necessary; but we must now proceed in regular order, to speak of those qualities in which each separate individual surpasses the others, beginning with him who is first mentioned. Now he, being an admirer of piety, the highest and greatest of all virtues, laboured earnestly to follow God, and to be obedient to the injunctions delivered by him, looking not only on those things as his commands which were signified to him by words and facts, but those also which were indicated by more express signs through the medium of nature, and which the truest of the outward senses comprehends before the uncertain and untrustworthy hearing can do so; (61) for if any one observes the arrangement which exists in nature, and the constitution according to which the world goes on, which is more excellent than any kind of reasoning, he learns, even though no one speaks to him, to study a course of life consistent with law and peace, looking to the example of good men. But the most manifest demonstrations of peace are those which the scriptures contain; and we must mention the first which also occurs the first in the order in which they are set down.