Origen held fast to the traditional teaching of the Apostles and to the Old Testament which he felt contained the sum of Christian truth,[359] and at the same time he worked freely as a speculative thinker. For the greater part of the period during which he was the head of the Alexandrian School, (c. 203-231) he was undisturbed by persecution and could work in the clear atmosphere of scientific study. His theology was built on the secular theology of his day.[360] God he regarded as wholly transcendent, but potentially everywhere present, incomprehensible to man save in so far as man could behold the revelation of him in nature and in Christ. He predicated justice, goodness, and omnipotence of God, not simply as potentialities, but as attributes exercised fully and eternally in the universe. Still to leave man a free agent, Origen was obliged to hold that God limited his own omnipotence. The belief in the eternal exercise of God’s attributes required him to regard creation as eternal, so that he held that God and his creatures had eternally existed; God therefore, he said, had never existed apart from his creation, but the two were coëternal. This does not mean that Origen regarded the present world as existing in visible form from eternity, for he taught quite the contrary: this present world did begin and will end in time, but it is only one in an infinite series of worlds, a single expression of the eternal creative activity of God.[361] The Logos in Origen’s system stands midway between God and the world. In opposition to those who claimed that the Logos had been begotten in time and was therefore a temporal creature, he insisted that the Logos was without beginning, but was eternally generated by God. In attempting to make his view clear he employed familiar figures, saying that the Logos, the eternal Son, was related to the Father, as the gleam to the source of light, or the will to the mind of man. He was the wisdom, the consciousness, and the activity of God; and he likewise was God’s perfect image, a second God. Yet in essence he was not independent, but rather one with the Father by whose will he was eternally created. Being created, however, he was one stage removed from God toward the multiple creation; being the medium of the Divine, he was the Creator of the world.[362] It will be observed that in this philosophical system there is no necessity for the redeemer, and indeed Origen made somewhat less use of this concept of Christ than most other writers. On Christ’s incarnation he insisted, but the essential work of the human Christ was revelation.[363]