Now when all the people were baptized, it came to pass, that when Jesus also was baptized, and praying, the heaven was opened,
All Commentaries on Luke 3:21 Go To Luke 3
John Chrysostom
AD 407
Now there was a Jewish baptism which removed the pollutions of the flesh, not the guilt of the conscience; but our baptism parts us from sin, washes the soul, and gives us largely the outpouring of the Spirit. But John's baptism was more excellent than the Jewish; for it did not bring men to the observance of bodily purifications, but taught them to turn from sin to virtue. But it was inferior to our baptism, in that it conveyed not the Holy Spirit, nor showed forth the remission which is by grace, for there was a certain end as it were of each baptism. But neither by the Jewish nor our own baptism was Christ baptized, for He needed not the pardon of sins, nor was that flesh destitute of the Holy Spirit which from the very beginning was conceived by the Holy Spirit; He was baptized by the baptism of John, that from the very nature of the baptism, you might know that He was not baptized because He needed the gift of the Spirit. But he says, fitting baptized and praying, that you might consider how fitting to one who has received baptism is constant prayer.
But he says, The heavens opened, as if till then they had been shut. But now the higher and the lower sheep-fold being brought into one, and there being one Shepherd of the sheep, the heavens opened, and man was incorporated a fellow citizen with the Angels.
The Holy Spirit descended also upon Christ as upon the Founder of our race, that He might be in Christ first of all who received Him not for Himself, but rather for us. Hence it follows: And the Holy Spirit descended. Let not any one imagine that He received Him because He had Him not. For He as God sent Him from above, and as man received Him below. Therefore from Him the Spirit fled down to Him, i.e. from His deity to His humanity.
That baptism savored partly of antiquity, partly of novelty. For that he should receive baptism from a Prophet showed antiquity, but the Spirit's descent denoted something new.
Or to show the meekness of the Lord, the Spirit now appears in the form of a dove, but at Pentecost like fire, to signify punishment. For when He was about to pardon offenses, gentleness was necessary; but having obtained grace, there remains for us the time of trial and judgment.
Christ indeed had already manifested Himself at His birth by many oracles, but because men would not consult them, He who had in the mean time remained secret, again more clearly revealed Himself in a second birth. For formerly a star in the heavens, now the Father at the waves of Jordan declared Him, and as the Spirit descended upon Him, pouring forth that voice over the head of Him who was baptized, as it follows, And a voice came from heaven, You are my beloved Son.