The object of the Christian Apologists, some of whom filled ecclesiastical offices and in various ways promoted spiritual progress,[341] was, as they themselves explained, to uphold the Christianity professed by the Christian Churches and publicly preached. They were convinced that the Christian faith was founded on revelation and that only a mind enlightened by God could grasp and maintain the faith. They acknowledged the Old Testament to be the authoritative source of God's revelation, maintained that the whole human race was meant to be reached by Christianity, and adhered to the early Christian eschatology. These views as well as the strong emphasis they laid upon human freedom and responsibility, enabled them to attain a firm standpoint in opposition to "Gnosticism," and to preserve their position within the Christian communities, whose moral purity and strength they regarded as a strong proof of the truth of this faith. In the endeavours of the Apologists to explain Christianity to the cultured world, we have before us the attempts of Greek churchmen to represent the Christian religion as a philosophy, and to convince outsiders that it was the highest wisdom and the absolute truth. These efforts were not rejected by the Churches like those of the so-called Gnostics, but rather became in subsequent times the foundation of the ecclesiastical dogmatic. The Gnostic speculations were repudiated, whereas those of the Apologists were accepted. The manner in which the latter set forth Christianity as a philosophy met with approval. What were the conditions under which ecclesiastical Christianity and Greek philosophy concluded the alliance which has found a place in the history of the world? How did this union attain acceptance and permanence, whilst "Gnosticism" was at first rejected? These are the two great questions the correct answers to which are of fundamental importance for the understanding of the history of Christian dogma.