The Holy Ghost is the "bond" (copula) of the Trinity, joining in perfect love the Father and the Son. Victorinus is the first to use this idea, which afterwards became common. It is based on the Neoplatonic triad of status, progressio, regressus ([Greek: monê, proodos, epistrophê]). In another place he symbolises the Holy Ghost as the female principle, the "Mother of Christ" in His eternal life. This metaphor is a relic of Gnosticism, which the Church wisely rejected.

The second Person of the Trinity contains in Himself the archetypes of everything. He is the "elementum," "habitaculum," "habitator," "locus" of the universe. The material world was created for man's probation. All spirits pre-existed, and their partial immersion in an impure material environment is a degradation from which they must aspire to be delivered. But the whole mundane history of a soul is only the realisation of the idea which had existed from all eternity in the mind of God. These doctrines show that Victorinus is involved in a dualistic view of matter, and in a form of predestinarianism; but he has no definite teaching on the relation of sin to the ideal world.

His language about Christ and the Church is mystical in tone. "The Church is Christ," he says; "The resurrection of Christ is our resurrection"; and of the Eucharist, "The body of Christ is life."

We now come to St. Augustine himself, who at one period of his life was a diligent student of Plotinus. It would be hardly justifiable to claim St. Augustine as a mystic, since there are important parts of his teaching which have no affinity to Mysticism; but it touched him on one side, and he remained half a Platonist. His natural sympathy with Mysticism was not destroyed by the vulgar and perverted forms of it with which he was first brought in contact. The Manicheans and Gnostics only taught him to distinguish true Mysticism from false: he soon saw through the pretensions of these sectaries, while he was not ashamed to learn from Plotinus. The mystical or Neoplatonic element in his theology will be clearly shown in the following extracts. In a few places he comes dangerously near to some of the errors which we found in Dionysius.

God is above all that can be said of Him. We must not even call Him ineffable;[194] He is best adored in silence,[195] best known by nescience,[196] best described by negatives.[197] God is absolutely immutable; this is a doctrine on which he often insists, and which pervades all his teaching about predestination. The world pre-existed from all eternity in the mind of God; in the Word of God, by whom all things were made, and who is immutable Truth, all things and events are stored up together unchangeably, and all are one. God sees the time-process not as a process, but gathered up into one harmonious whole. This seems very near to acosmism, but there are other passages which are intended to guard against this error. For instance, in the Confessions[198] he says that "things above are better than things below; but all creation together is better than things above"; that is to say, true reality is something higher than an abstract spirituality.[199]

He is fond of speaking of the Beauty of God; and as he identifies beauty with symmetry,[200] it is plain that the formless "Infinite" is for him, as for every true Platonist, the bottom and not the top of the scale of being. Plotinus had perhaps been the first to speak of the Divine nature as the meeting-point of the Good, the True, and the Beautiful; and this conception, which is of great value, appears also in Augustine. There are three grades of beauty, they both say, corporeal, spiritual, and divine,[201] the first being an image of the second, and the second of the third.[202] "Righteousness is the truest beauty,[203]" Augustine says more than once. "All that is beautiful comes from the highest Beauty, which is God." This is true Platonism, and points to Mysticism of the symbolic kind, which we must consider later. St. Augustine is on less secure ground when he says that evil is simply the splash of dark colour which gives relief to the picture; and when in other places he speaks of it as simple privation of good. But here again he closely follows Plotinus.[204]

St. Augustine was not hostile to the idea of a World-Soul; he regards the universe as a living organism;[205] but he often warns his readers against identifying God and the world, or supposing that God is merely immanent in creation. The Neoplatonic teaching about the relation of individual souls to the World-Soul may have helped him to formulate his own teaching about the mystical union of Christians with Christ. His phrase is that Christ and the Church are "una persona."

St. Augustine arranges the ascent of the soul in seven stages.[206] But the higher steps are, as usual, purgation, illumination, and union. This last, which he calls "the vision and contemplation of truth," is "not a step, but the goal of the journey." When we have reached it, we shall understand the wholesomeness of the doctrines with which we were fed, as children with milk; the meaning of such "hard sayings" as the resurrection of the body will become plain to us. Of the blessedness which attends this state he says elsewhere,[207] "I entered, and beheld with the mysterious eye of my soul the light that never changes, above the eye of my soul, above my intelligence. It was something altogether different from any earthly illumination. It was higher than my intelligence because it made me, and I was lower because made by it. He who knows the truth knows that light, and he who knows that light knows eternity. Love knows that light." And again he says,[208] "What is this which flashes in upon me, and thrills my heart without wounding it? I tremble and I burn; I tremble, feeling that I am unlike Him; I burn, feeling that I am like Him."

One more point must be mentioned before we leave St. Augustine. In spite of, or rather because of, his Platonism, he had nothing but contempt for the later Neoplatonism, the theurgic and theosophic apparatus of Iamblichus and his friends. I have said nothing yet about the extraordinary development of magic in all its branches, astrology, necromancy, table-rapping, and other kinds of divination, charms and amulets and witchcraft, which brought ridicule upon the last struggles of paganism. These aberrations of Nature-Mysticism will be dealt with in their later developments in my seventh Lecture. St. Augustine, after mentioning some nonsensical incantations of the "abracadabra" kind, says, "A Christian old woman is wiser than these philosophers." In truth, the spirit of Plato lived in, and not outside Christianity, even in the time of Porphyry. And on the cultus of angels and spirits, which was closely connected with theurgic superstition, St. Augustine's judgment is very instructive. "Whom should I find," he asks, "to reconcile me to Thee? Should I approach the angels? With what prayers, with what rites? Many, as I hear, have tried this method, and have come to crave for curious visions, and have been deceived, as they deserved.[209]"

In spite of St. Augustine's Platonism and the immense influence which he exercised, the Western Church was slow in developing a mystical theology. The Greek Mysticism, based on emanation, was not congenial to the Western mind, and the time of the German, with its philosophy of immanence, was not yet. The tendency of Eastern thinkers is to try to gain a view of reality as a whole, complete and entire: the form under which it most readily pictures it is that of space. The West seeks rather to discover the universal laws which in every part of the universe are working out their fulfilment. The form under which it most readily pictures reality is that of time.[210] Thus Neoplatonism had to undergo certain modifications before it could enter deeply into the religious consciousness of the West.