Such were the forms and modes of his conversion,—somewhat different from the experience of Augustine or of Luther, yet not less real and permanent. Those days were the happiest of his life. He had leisure and he had enthusiasm. He desired neither riches nor honors, but the peace of a forgiven soul He was a monk without losing his humanity; a philosopher without losing his taste for the Bible; a Christian without repudiating the learning of the schools. But the influence of early education, his practical yet speculative intellect, his inextinguishable sympathies, his desire for usefulness, and possibly an unsubdued ambition to exert a greater influence would not allow him wholly to bury himself. He made long visits to the friends and habitations he had left, in order to stimulate their faith, relieve their necessities, and encourage them in works of benevolence; leading a life of alternate study and active philanthropy,—learning from the accomplished Diodorus the historical mode of interpreting the Scriptures, and from the profound Theodorus the systems of ancient philosophy. Thus did he train himself for his future labors, and lay the foundation for his future greatness. It was thus he accumulated those intellectual treasures which he afterwards lavished at the imperial court.
But his health at last gave way; and who can wonder? Who can long thrive amid exhausting studies on root dinners and ascetic severities? He was obliged to leave his cave, where he had dwelt six blessed years; and the bishop of Antioch, who knew his merits, pressed him into the active service of the Church, and ordained him deacon,—for the hierarchy of the Church was then established, whatever may have been the original distinctions of the clergy. With these we have nothing to do. But it does not appear that he preached as yet to the people, but performed like other deacons the humble office of reader, leaving to priests and bishops the higher duties of a public teacher. It was impossible, however, for a man of his piety and his gifts, his melodious voice, his extensive learning, and his impressive manners long to remain in a subordinate post. He was accordingly ordained a presbyter, A.D. 381, by Bishop Flavian, in the spacious basilica of Antioch, and the active labors of his life began at the age of thirty-four.