If space allowed, numerous illustrations might be adduced to show how pagan philosophy and mysticism had influenced Christian theologians in details. Many examples we have already seen in passing, such as the view held both by Clement and Origen, as well as by the Gnostics and perhaps by Paul, that the supreme Christian truth was to be obtained by direct revelation, by a vision of the Divine. This was a current belief not only in the later mystic philosophies, like Neopythagoreanism and Neoplatonism, but also in the mystic religions, and in the Greek mysteries likewise. Again it would be possible to show that Origen's ethical system owed much more to Stoicism and to later Platonism than to the teachings of Christ, which, however, were easily brought into accord with the philosopher's doctrines. Or once more we might enlarge on the development of the Triune nature of God, whereby the transcendent God and the Logos of pagan theology were united with a varying concept of the spirit of God, also familiar in Hellenic thought, to produce the Trinity of Christian dogma.
from pages 349-350, The Religious Thought of the Greeks