Secondly, in order to designate the seven gifts of the Holy Ghost, which are signified by the properties of the dove. For the dove dwells beside the running stream, in order that, on perceiving the hawk, it may plunge in and escape. This refers to the gift of wisdom, whereby the saints dwell beside the running waters of Holy Scripture, in order to escape the assaults of the devil. Again, the dove prefers the more choice seeds. This refers to the gift of knowledge, whereby the saints make choice of sound doctrines, with which they nourish themselves. Further, the dove feeds the brood of other birds. This refers to the gift of counsel, with which the saints, by teaching and example, feed men who have been the brood, i.e. imitators, of the devil. Again, the dove tears not with its beak. This refers to the gift of understanding, wherewith the saints do not rend sound doctrines, as heretics do. Again, the dove has no gall. This refers to the gift of piety, by reason of which the saints are free from unreasonable anger. Again, the dove builds its nest in the cleft of a rock. This refers to the gift of fortitude, wherewith the saints build their nest, i.e. take refuge and hope, in the death wounds of Christ, who is the Rock of strength. Lastly, the dove has a plaintive song. This refers to the gift of fear, wherewith the saints delight in bewailing sins.
Thirdly, the Holy Ghost appeared under the form of a dove on account of the proper effect of baptism, which is the remission of sins and reconciliation with God: for the dove is a gentle creature. Wherefore, as Chrysostom says, (Hom. xii in Matth.), "at the Deluge this creature appeared bearing an olive branch, and publishing the tidings of the universal peace of the whole world: and now again the dove appears at the baptism, pointing to our Deliverer."
Fourthly, the Holy Ghost appeared over our Lord at His baptism in the form of a dove, in order to designate the common effect of baptism---namely, the building up of the unity of the Church. Hence it is written ( Eph. 5:25-27 ): "Christ delivered Himself up . . . that He might present . . . to Himself a glorious Church, not having spot or wrinkle, or any such thing . . . cleansing it by the laver of water in the word of life." Therefore it was fitting that the Holy Ghost should appear at the baptism under the form of a dove, which is a creature both loving and gregarious. Wherefore also it is said of the Church ( Cant 6:8 ): "One is my dove."
But on the apostles the Holy Ghost descended under the form of fire, for two reasons. First, to show with what fervor their hearts were to be moved, so as to preach Christ everywhere, though surrounded by opposition. And therefore He appeared as a fiery tongue. Hence Augustine says (Super Joan., Tract. vi): Our Lord "manifests" the Holy Ghost "visibly in two ways"---namely, "by the dove corning upon the Lord when He was baptized; by fire, coming upon the disciples when they were met together . . . In the former case simplicity is shown, in the latter fervor . . . We learn, then, from the dove, that those who are sanctified by the Spirit should be without guile: and from the fire, that their simplicity should not be left to wax cold. Nor let it disturb anyone that the tongues were cloven . . . in the dove recognize unity."
Secondly, because, as Chrysostom says (Gregory, Hom. xxx in Ev.): "Since sins had to be forgiven," which is effected in baptism, "meekness was required"; this is shown by the dove: "but when we have obtained grace we must look forward to be judged"; and this is signified by the fire.
Whether the dove in which the Holy Ghost appeared was real?
Objection 1: It would seem that the dove in which the Holy Ghost appeared was not real. For that seems to be a mere apparition which appears in its semblance. But it is stated ( Lk. 3:22 ) that the "Holy Ghost descended in a bodily shape as a dove upon Him." Therefore it was not a real dove, but a semblance of a dove.
Objection 2: Further, just as "Nature does nothing useless, so neither does God" (De Coelo i). Now since this dove came merely "in order to signify something and pass away," as Augustine says (De Trin. ii), a real dove would have been useless: because the semblance of a dove was sufficient for that purpose. Therefore it was not a real dove.
Objection 3: Further, the properties of a thing lead us to a knowledge of that thing. If, therefore, this were a real dove, its properties would have signified the nature of the real animal, and not the effect of the Holy Ghost. Therefore it seems that it was not a real dove.
On the contrary, Augustine says (De Agone Christ. xxii): "Nor do we say this as though we asserted that our Lord Jesus Christ alone had a real body, and that the Holy Ghost appeared to men's eyes in a fallacious manner: but we say that both those bodies were real."
I answer that, As stated above (Q[5], A[1]), it was unbecoming that the Son of God, who is the Truth of the Father, should make use of anything unreal; wherefore He took, not an imaginary, but a real body. And since the Holy Ghost is called the Spirit of Truth, as appears from Jn. 16:13, therefore He too made a real dove in which to appear, though He did not assume it into unity of person. Wherefore, after the words quoted above, Augustine adds: "Just as it behooved the Son of God not to deceive men, so it behooved the Holy Ghost not to deceive. But it was easy for Almighty God, who created all creatures out of nothing, to frame the body of a real dove without the help of other doves, just as it was easy for Him to form a true body in Mary's womb without the seed of a man: since the corporeal creature obeys its Lord's command and will, both in the mother's womb in forming a man, and in the world itself in forming a dove."
Reply to Objection 1: The Holy Ghost is said to have descended in the shape or semblance of a dove, not in the sense that the dove was not real, but in order to show that He did not appear in the form of His substance.
Reply to Objection 2: It was not superfluous to form a real dove, in which the Holy Ghost might appear, because by the very reality of the dove the reality of the Holy Ghost and of His effects is signified.
Reply to Objection 3: The properties of the dove lead us to understand the dove's nature and the effects of the Holy Ghost in the same way. Because from the very fact that the dove has such properties, it results that it signifies the Holy Ghost.
Whether it was becoming, when Christ was baptized that the Father's voice should be heard, bearing witness to the Son?
Objection 1: It would seem that it was unbecoming when Christ was baptized for the Father's voice to be heard bearing witness to the Son. For the Son and the Holy Ghost, according as they have appeared visibly, are said to have been visibly sent. But it does not become the Father to be sent, as Augustine makes it clear (De Trin. ii). Neither, therefore, (does it become Him) to appear.
Objection 2: Further, the voice gives expression to the word conceived in the heart. But the Father is not the Word. Therefore He is unfittingly manifested by a voice.
Objection 3: Further, the Man-Christ did not begin to be Son of God at His baptism, as some heretics have stated: but He was the Son of God from the beginning of His conception. Therefore the Father's voice should have proclaimed Christ's Godhead at His nativity rather than at His baptism.
On the contrary, It is written ( Mat. 3:17 ): "Behold a voice from heaven, saying: This is My beloved Son in whom I am well pleased."
I answer that, As stated above (A[5]), that which is accomplished in our baptism should be manifested in Christ's baptism, which was the exemplar of ours. Now the baptism which the faithful receive is hallowed by the invocation and the power of the Trinity; according to Mat. 28:19 : "Go ye and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost." Wherefore, as Jerome says on Matt. 3:16 , 17 : "The mystery of the Trinity is shown forth in Christ's baptism. our Lord Himself is baptized in His human nature; the Holy Ghost descended in the shape of a dove: the Father's voice is heard bearing witness to the Son." Therefore it was becoming that in that baptism the Father should be manifested by a voice.
Reply to Objection 1: The visible mission adds something to the apparition, to wit, the authority of the sender. Therefore the Son and the Holy Ghost who are from another, are said not only to appear, but also to be sent visibly. But the Father, who is not from another, can appear indeed, but cannot be sent visibly.
Reply to Objection 2: The Father is manifested by the voice, only as producing the voice or speaking by it. And since it is proper to the Father to produce the Word---that is, to utter or to speak---therefore was it most becoming that the Father should be manifested by a voice, because the voice designates the word. Wherefore the very voice to which the Father gave utterance bore witness to the Sonship of the Word. And just as the form of the dove, in which the Holy Ghost was made manifest, is not the Nature of the Holy Ghost, nor is the form of man in which the Son Himself was manifested, the very Nature of the Son of God, so neither does the voice belong to the Nature of the Word or of the Father who spoke. Hence ( Jn. 5:37 ) our Lord says: "Neither have you heard His," i.e. the Father's, "voice at any time, nor seen His shape." By which words, as Chrysostom says (Hom. xl in Joan.), "He gradually leads them to the knowledge of the philosophical truth, and shows them that God has neither voice nor shape, but is above all such forms and utterances." And just as the whole Trinity made both the dove and the human nature assumed by Christ, so also they formed the voice: yet the Father alone as speaking is manifested by the voice, just as the Son alone assumed human nature, and the Holy Ghost alone is manifested in the dove, as Augustine [*Fulgentius, De Fide ad Petrum] makes evident.
Reply to Objection 3: It was becoming that Christ's Godhead should not be proclaimed to all in His nativity, but rather that It should be hidden while He was subject to the defects of infancy. But when He attained to the perfect age, when the time came for Him to teach, to work miracles, and to draw men to Himself then did it behoove His Godhead to be attested from on high by the Father's testimony, so that His teaching might become the more credible. Hence He says ( Jn. 5:37 ): "The Father Himself who sent Me, hath given testimony of Me." And specially at the time of baptism, by which men are born again into adopted sons of God; since God's sons by adoption are made to be like unto His natural Son, according to Rom. 8:29 : "Whom He foreknew, He also predestinated to be made conformable to the image of His Son." Hence Hilary says (Super Matth. ii) that when Jesus was baptized, the Holy Ghost descended on Him, and the Father's voice was heard saying: "'This is My beloved Son,' that we might know, from what was accomplished in Christ, that after being washed in the waters of baptism the Holy Ghost comes down upon us from on high, and that the Father's voice declares us to have become the adopted sons of God."