2 We worship, then, one deity under the threefold appellation of the Almighty God the Father, and his son Christ, and the Holy Spirit. While these are one and the same, we believe also that the Father properly dwells in the highest or principal light, which Paul calls "light inaccessible," and the Son in his second or visible light. And as the Son is himself twofold, according to the apostle, who speaks of Christ as the power of God and the wisdom of God, we believe that His power dwells in the sun, and His wisdom in the moon.
We also believe that the Holy Spirit, the third majesty, has His seat and His home in the whole circle of the atmosphere. By His influence and spiritual infusion, the earth conceives and brings forth the mortal Jesus, who, as hanging from every tree, is the life and salvation of men. Though you oppose these doctrines so violently, your religion resembles ours in attaching the same sacredness to the bread and wine that we do to everything. This is our belief, which you will have an opportunity of hearing more of, if you wish to do so. Meanwhile there is some force in the consideration that you or any one that is asked where his God dwells, will say that he dwells in light; so that the testimony in favor of my worship is almost universal.
Source: Reply to Faustus the Manichaean (New Advent)