Augustine of Hippo

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(de Trin. ii. 5.) It is easy to understand how the Holy Ghost should be said to be sent, when as it were a dove in visible shape descended on the Lord; that is, there was created a certain appearance for the time in which the Holy Spirit might be visibly shewn. And this operation thus made visible and offered to mortal view, is called the mission of the Holy Spirit, not that His invisible substance was seen, but that the hearts of men might be roused by the external appearance to contemplate the unseen eternity. Yet this creature in the shape of which the Spirit appeared, was not taken into unity of person, as was that human shape taken of the Virgin. For neither did the Spirit bless the dove, nor unite it with Himself for all eternity, in unity of person. Further, though that dove is called the Spirit, so far as to shew that in this dove was a manifestation of the Spirit, yet can we not say of the Holy Spirit that He is God and dove, as we say of the Son that He is God and man; and yet it is not as we say of the Son that He is the Lamb of God, as not only has John Baptist declared, but as John the Evangelist saw the vision of the Lamb slain in the Apocalypse. For this was a prophetic vision, not put before the bodily eyes in bodily shape, but seen in the Spirit in spiritual images. But concerning this dove none ever doubted that it was seen with the bodily eye; not that we say the Spirit is a dove as we say Christ is a Rock; (for that Rock was Christ.) (1 Cor. 10:4.) For that Rock already existed as a creature, and from the resemblance of its operation was called by the name of Christ, (whom it figured;) not so this dove, which was created at the moment for this single purpose. It seems to me to be more like the flame which appeared to Moses in the bush, or that which the people followed in the wilderness, or to the thunderings and lightnings which were when the Law was given from the mount. For all these were visible objects intended to signify something, and then to pass away. For that such forms have been from time to time seen, the Holy Spirit is said to have been sent; but these bodily forms appeared for the time to shew what was required, and then ceased to be.