With the greatest clearness, accordingly, the Word has spoken respecting Himself by Hosea: “I am your Instructor.”[260] Now piety is instruction, being the learning of the service of God, and training in the knowledge of the truth, and right guidance which leads to heaven. And the word “instruction”[261] is employed variously. For there is the instruction of him who is led and learns, and that of him who leads and teaches; and there is, thirdly, the guidance itself; and fourthly, what is taught, as the commandments enjoined. Now the instruction which is of God is the right direction of truth to the contemplation of God, and the exhibition of holy deeds in everlasting perseverance. As therefore the general directs the phalanx, consulting the safety of his soldiers, and the pilot steers the vessel, desiring to save the passengers; so also the Instructor guides the children to a saving course of conduct, through solicitude for us; and, in general, whatever we ask in accordance with reason from God to be done for us, will happen to those who believe in the Instructor. And just as the helmsman does not always yield to the winds, but sometimes, turning the prow towards them, opposes the whole force of the hurricanes; so the Instructor never yields to the blasts that blow in this world, nor commits the child to them like a vessel to make shipwreck on a wild and licentious course of life; but, wafted on by the favouring breeze of the Spirit of truth, stoutly holds on to the child’s helm,--his ears, I mean,--until He bring him safe to anchor in the haven of heaven. What is called by men an ancestral custom passes away in a moment, but the divine guidance is a possession which abides for ever. They say that Phœnix was the instructor of Achilles, and Adrastus of the children of Crœsus; and Leonides of Alexander, and Nausithous of Philip. But Phœnix was women-mad, Adrastus was a fugitive. Leonides did not curtail the pride of Alexander, nor Nausithous reform the drunken Pellæan. No more was the Thracian Zopyrus able to check the fornication of Alcibiades; but Zopyrus was a bought slave, and Ticinnus, the tutor of the children of Themistocles, was a lazy domestic. They say also that he invented the Sicinnian dance. Those have not escaped our attention who are called royal instructors among the Persians; whom, in number four, the kings of the Persians select with the greatest care from all the Persians, and set over their sons. But the children only learn the use of the bow, and on reaching maturity have sexual intercourse with sisters, and mothers, and women, wives and courtesans innumerable, practised in intercourse like the wild boars.