The completion of his studies found him versed in astronomy, the higher mathematics, thoroughly acquainted with the sentiments and theories of the different philosophical schools, and more or less familiar with the construction of languages and the leading issues of the times. Reduced to straitened circumstances in consequence of the persecution, he opened, on his own responsibility, an institution for dialectics, music, and profane sciences. This was a dangerous enterprise for one so young, but it was the only alternative to avoid a life of dependency and association with heretics, as well as to assist a helpless mother and a large family. He felt bound to shun the enemies of the church; he refused to mingle in their company, save when the necessity of their spiritual welfare demanded it, or the exigencies of the occasion prevented his escape. Scrupulous even to the spirit of the apostolic teachings, rather than associate with the opponents of Christianity, he preferred to sacrifice the friendships of his youth and the liberality of his patroness, at a time, too, when he stood most in need of assistance. His reputation attracted large numbers to his lectures, and the applause he received, while it elevated him in popularity, was the source of interior humiliation, the antidote of pride. Demetrius, Bishop of Alexandria, moved by the superior attainments, the fervent piety and unswerving orthodoxy in faith, of the young Christian, appointed him regent of the famous catechetical school, A.D. 203. The course of studies taught in this institution comprised, aside from secular pursuits, theology and Scriptural expositions. Origen(32) was only eighteen years of age when he assumed this responsible charge—a charge that, in the history of the province, had never been committed but to persons of advanced years. This appointment, then, was an exception, strange in the extreme; but Origen was an exceptional scholar—so exceptional, indeed, that history has failed to record his compeer at that time of life in any other person. But, as St. Jerome(33) remarks, “From his childhood he was a great man.” And Bossuet, admiring the young Alexandrian, towering in intellect above those of his day, like Saul above his brethren, declares: “Il se rendit célèbre par toute l’Eglise des sa première jeunesse et enseigna de grandes vérités.”(34) The violence of the persecution under Septimius Severus had interrupted the Christian school of Alexandria, and forced its president, Clement, to fly from his murderers. It was during his retirement and under the uplifted sword that Origen assumed the regency—a position as precarious and laborious as it was honorable. It required varied knowledge, uncommon prudence, and unswerving adhesion to the traditions of Christ’s ambassadors.