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name "Image" is a personal name.
Reply Obj. 1: Image, properly speaking, means whatever proceeds forth in likeness to another. That to the likeness of which anything proceeds, is properly speaking called the exemplar, and is improperly called the image. Nevertheless Augustine (Fulgentius) uses the name of Image in this sense when he says that the divine nature of the Holy Trinity is the Image to whom man was made.
Reply Obj. 2: species, as mentioned by Hilary in the definition of image, means the form derived from one thing to another. In this sense image is said to be the species of anything, as that which is assimilated to anything is called its form, inasmuch as it has a like form.
Reply Obj. 3: Imitation in God does not signify posteriority, but only assimilation.
SECOND ARTICLE [I, Q. 35, Art. 2]
Whether the Name of Image Is Proper to the Son?
Objection 1: It would seem that the name of Image is not proper to the Son; because, as Damascene says (De Fide Orth. i, 18), "The Holy Ghost is the Image of the Son." Therefore Image does not belong to the Son alone.
Obj. 2: Further, similitude in expression belongs to the nature of an image, as Augustine says (QQ. lxxxiii, qu. 74). But this belongs to the Holy Ghost, Who proceeds from another by way of similitude. Therefore the Holy Ghost is an Image; and so to be Image does not belong to the Son alone.
Obj. 3: Further, man is also called the image of God, according to 1 Cor. 11:7, "The man ought not to cover his head, for he is the image and the glory of God." Therefore Image is not proper to the Son.
_On the contrary,_ Augustine says (De Trin. vi, 2): "The Son alone is the Image of the Father."