2 And these things indeed we see; they lie before our eyes. But what of those we do not see, as angels, virtues, powers, dominions, and every inhabitant of this fabric which is above the heavens, and beyond the reach of our eyes? Yet angels, too, when necessary, often showed themselves to men. Has not God made all these too by His Word, that is, by His only Son, our Lord Jesus Christ? What of the human soul itself, which is not seen, and yet by its works shown in the flesh excites great admiration in those that duly reflect on them—by whom was it made, unless by God?
And through whom was it made, unless through the Son of God? Not to speak as yet of the soul of man: the soul of any brute whatever, see how it regulates the huge body, puts forth the senses, the eyes to see, the ears to hear, the nostrils to smell, the taste to discern flavors— the members, in short, to execute their respective functions! Is it the body, not the soul, namely the inhabitant of the body, that does these things? The soul is not apparent to the eyes, nevertheless it excites admiration by these its actions.
Direct now your consideration to the soul of man, on which God has bestowed understanding to know its Creator, to discern and distinguish between good and evil, that is, between right and wrong: see how many things it does through the body! Observe this whole world arranged in the same human commonwealth, with what administrations, with what orderly degrees of authority, with what conditions of citizenship, with what laws, manners, arts! The whole of this is brought about by the soul, and yet this power of the soul is not visible.
When withdrawn from the body, the latter is a mere carcass: first, it in a manner preserves it from rottenness. For all flesh is corruptible, and falls off into putridity unless preserved by the soul as by a kind of seasoning. But the human soul has this quality in common with the soul of the brute; those qualities rather are to be admired which I have stated, such as belong to the mind and intellect, wherein also it is renewed after the image of its Creator, after whose image man was formed. What will this power of the soul be when this body shall have put on incorruption, and this mortal shall have put on immortality? If such is its power, acting through corruptible flesh, what shall be its power through a spiritual body, after the resurrection of the dead?
Yet this soul, as I have said, of admirable nature and substance, is a thing invisible, intellectual; this soul also was made by God Jesus, for He is the Word of God. “All things were made by Him, and without Him was nothing made.”
Source: Tractates on the Gospel of John (New Advent)