John Chrysostom
It is moreover an allusion to ancient history; for in the deluge this creature appeared bearing an olive-branch, and tidings of rest to the world. All which things were a type of things to come. For now also a dove appears pointing out to us our liberator, and for an olive-branch bringing the adoption of the human race.
But though you see it not, be not therefore unbelieving, for in the beginnings of spiritual matters sensible visions are always offered, for their sakes who can form no idea of things that have no body; which if they occur not in later times, yet faith may be established by those wonders once wrought.
This action of Christ’s has a figurative meaning pertaining to all who were after Him to be baptized; and therefore he says, straightway He ascended, and not simply He ascended, for all who are worthily baptized in Christ, straightway ascend from the water; that is, make progress in virtues, and are carried on towards a heavenly dignity. They who had gone down to the water carnal and sinful sons of Adam, straightway ascend from the water spiritual sons of God. But if some by their own faults make no progress after baptism, what is that to the baptism?
For had the actual creation of the heavens been opened, he would not have said were opened to Him, for a physical opening would have been open to all. But some one will say, What, are the heavens then closed to the eye of the Son of God, who even when on earth is present in heaven? But it must be known, that as He was baptized according to the ordinance of humanity that He had taken on Him, so the heavens were opened to His sight as to His human nature, though as to His divine He was in heaven.
Perhaps there were before some unseen obstacles which hindered the souls of the dead from entering the skies. I suppose that since Adam’s sin no soul had mounted the skies, but the heavens were continually closed. When, lo! on Christ’s baptism they were again opened; after He had overcome by the Cross the great tyrant death, henceforward the heaven, never more to be closed, needed not gates, so that the Angels say not, ‘Open ye gates,’ for they were open, but take away the gates. (Ps. 24:7.) Or the heavens are opened to the baptized, and they see those things which are in heaven, not by seeing them with the bodily eye, but by believing with the spiritual eye of faith.
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Or thus; The heavens are the divine Scriptures, which all read but all do not understand, except they who have been so baptized as to receive the Holy Spirit. Thus the Scriptures of the Prophets were at the first sealed to the Apostles, but after they had received the Holy Spirit, all Scripture was opened to them. However, in whatever way we interpret, the heavens were opened to Him, that is to all, on His account; as if the Emperor were to say to any one preferring a petition for another, This boon I grant not to him but to you; that is, to him, for your sake.
The Holy Ghost took the likeness of a dove, as being more than other animals susceptible of love. All other forms of righteousness which the servants of God have in truth and verity, the servants of the Devil have in spurious imitation; the love of the Holy Spirit alone an unclean spirit cannot imitate. And the Holy Ghost has therefore reserved to Himself this special manifestation of love, because by no testimony is it so clearly seen where He dwells as by the grace of love.