During the first three centuries of our era schools were established at Alexandria, Jerusalem, Edessa, Antioch, and other centres of Eastern wealth and learning; of these, that at Alexandria, founded by St. Mark, A.D. 60, was the most celebrated, and had for its teachers and scholars some of the most learned men of the period. They were catechetical in their nature, and at first were confined to oral instructions on the chief articles of the faith and the nature of the sacraments; but in process of time their sphere of usefulness was greatly enlarged, and the character of the studies pursued in them assumed a wider and higher tone, till not only dogmatic theology and Christian ethics, but human sciences and profane literature, were freely taught. Thus we read that, toward the close of the second century, St. Pantaeus, a converted Stoic of great erudition, and Clement of Alexandria, who is said to have "visited all lands and studied in all schools in search of truth," taught in the school of St. Mark, with an eloquence so convincing, and a knowledge of Grecian philosophy so thorough, that multitudes of Gentiles flocked to hear them, astonished to find the doctrines of the new faith expounded in the polished language of Cicero, and the very logic of Aristotle turned against the pantheistic philosophy of Greece. Their successor, the celebrated Origen, whose reputation has outlived all the attacks of time, in a letter to his friend St. Gregory, gives us some idea of the course of instruction pursued in his time, in this school, in regard to the study of the human sciences. "They are to be used," he writes, "so that they may contribute to the understanding of the Scriptures; for just as philosophers are accustomed to say that geometry, music, grammar, rhetoric, and astronomy, all dispose us to the study of philosophy, so we may say that philosophy, rightly studied, disposes us to the study of Christianity. {46} We are permitted, when we go out of Egypt, to carry with us the riches of the Egyptians wherewith to adorn the tabernacle; only let us beware how we reverse the process, and leave Israel to go down into Egypt and seek for treasure; that is what Jeroboam did in olden time, and what heretics do in our own." Here we find expressed, at so early a day, the beautiful idea of the church respecting education; that enduring pyramid which she would build up, whose base is human science, and whose apex is the knowledge of God.