Seek nothing with exterior gold and bodily adornment; but consider the garment as one worthy to adorn him who is according to the image of his Creator, as the apostle says: “Stripping off the old man, and putting on the new, one that is being renewed unto perfect knowledge ‘according to the image of his Creator.’” And he who has put on “the heart of mercy, kindness, humility, patience and meekness” is clothed within and has adorned the inner man.
And even so we say that the true and perfect soul is the human soul, as is clear from the very nature of its operations in both sensory power and intellect. Anything else that shares in life, because it possesses the power of growth, we call animate by a sort of customary misuse of language, because in these cases the soul does not exist in a perfect condition…. Thus Paul, advising those who were able to hear him to lay hold on perfection, indicates also the mode in which they may attain that object. He tells them that they must “put off the old man” and put on the man “which is renewed after the image of him that created him.” Now may we all return to that divine grace in which God at the first created man, when he said, “Let us make man in our image and likeness.”
Therefore, as upon the cross it was not the fullness of the Godhead but our weakness that was brought into subjection, so also will the Son hereafter become subject to the Father in his participation in our nature. This is so that when the lusts of the flesh are brought into subjection the heart may have no concern for riches or ambition or pleasures. The intention is that God may be all to us, if we live after his image and likeness, as far as we can attain to it, through all. The benefit has passed, then, from the individual to the community; for in his flesh he has tamed the nature of all human flesh…. Therefore, “laying aside all these,” that is those things we read of: “anger, malice, blasphemy, filthy communication”; as he also says below: “Let us, having put off the old man with his deeds, put on the new man, which is renewed in knowledge after the image of him that created him."
"Seeing that ye have put off the old man with his doings, and have put on the new man, which is being renewed unto knowledge after the image of Him that created him."
It is worth enquiring here, what can be the reason why he calls the corrupt life, "members," and "man," and "body," and again the virtuous life, the same. And if "the man" means "sins," how is it that he saith, "with his doings"? For once he said, "the old man," showing that this is not man, but the other. The moral choice doth rather determine one than the substance, and is rather "man" than the other. For his substance casteth him not into hell, nor leadeth him into the kingdom, but men the themselves: and we neither love nor hate any one so far as he is man, but so far as he is such or such a man. If then the substance be the body, and in either sort cannot be accountable, how doth he say that it is evil? But what is that he saith, "with his doings"? He means the choice, with the acts. And he calleth him "old," on purpose to show his deformity, and hideousness, and imbecility; and "new," as if to say, Do not expect that it will be with this one even as with the other, but the reverse: for ever as he farther advances, he hasteneth not on to old age, but to a youthfulness greater than the preceding. For when he hath received a fuller knowledge, he is both counted worthy of greater things, and is in more perfect maturity, in higher vigor; and this, not from youthfulness alone, but from that "likeness" also, "after" which he is. Lo! the best life is styled a creation, after the image of Christ: for this is the meaning of, "after the image of Him that created him," for Christ too came not finally to old age, but was so beautiful as it is not even possible to tell.
One royal form it hath, that, namely, of Christ. They whom he has in view, appear to me rather to be of the Gentiles. For like as earth, being but sand, even though one part be greater, another less, losing its own previous form, doth afterwards become gold; and like as wool, of whatever kind it be, receiveth another aspect, and hides its former one: so truly is it also with the faithful.
The renewal and reforming of the mind takes place “after God,” or “after God’s image”: it is said to be “after God,” to exclude one thinking it to be after some other creature; and “after God’s image,” to make it plain that the renewal is effected in the place where God’s image is, that is, in the mind. .
[AD 202] Irenaeus on Colossians 3:9