5 The lesson of today, brethren, is easy; but on account of what was due yesterday (for I know what I have delayed, not withdrawn, and the Lord has deigned to allow me even today to speak to you), recall to mind what you ought to demand, if perhaps, while preserving piety and wholesome humility, we may in some measure stretch out ourselves, not against God, but towards Him, and lift up our soul, pouring it out above us, like the Psalmist, to whom it was said, “Where is your God?”
“On these things,” says he, “I meditated, and poured out my soul above me.” Therefore let us lift up our soul to God, not against God; for this also is said, “To You, O Lord, I have lifted up my soul.” And let us lift it up with His own assistance, for it is heavy. And from what cause is it heavy? Because the body which is corrupt weighs down the soul, and the earthly tabernacle depresses the mind while meditating on many things. Let us try, then, whether we may not be able to withdraw our mind from many things in order to concentrate it on one, and to raise it to one (which indeed we cannot do, as I have said, unless He assist us who wills our souls to be raised to Himself).
And so we may apprehend in some measure how the Word of God, the only begotten of the Father, the co-eternal and equal with the Father, does not anything except what He sees the Father doing, while yet the Father Himself does not anything but through the Son, who sees Him doing. Since the Lord Jesus, as it seems to me—willing here to make known some great matter to those that give attention to it, and to pour into those that are capable of receiving, and to rouse, on the other hand, the incapable to assiduity, in order that, while not yet understanding, they may by right living be made capable—has intimated to us that the human soul and rational mind which is in man, not in the beast, is invigorated, enlightened, and made happy in no other way than by the very substance of God: that the soul itself gets somewhat by and of the body, and yet holds the body subject to it, while the senses of the body can be soothed and delighted by things bodily, and that because of this kind of fellowship of soul and body in this life, and in this mutual embrace of theirs, the soul is delighted when the bodily senses are soothed, and saddened when they are offended; while yet the happiness by which the soul itself is made happy cannot be realized but by a participation of that ever-living, unchangeable life, of that eternal substance, which is God: that as the soul, which is inferior to God, causes the body, which is inferior to itself, to live, so that alone which is superior to the soul can cause that same soul to live happily. For the soul is higher than the body, and higher than the soul is God. It bestows something on its inferior, while there is something bestowed on itself by the superior. Let it serve its Lord, that it may not be trampled on by its own servant. This, brethren, is the Christian religion, which is preached through the whole world, while its enemies are dismayed; who, where they are conquered, murmur, and fiercely rage against it where they prevail. This is the Christian religion, that one God be worshipped, not many gods, because only one God can make the soul happy. It is made happy by participation of God. Not by participation of a holy soul does the feeble soul become happy, nor by participation of an angel does the holy soul become happy; but if the feeble soul seeks to be happy, let it seek that by which the holy soul is made happy. For you are made happy, not of an angel, but the angel as well as you of the same source.
Source: Tractates on the Gospel of John (New Advent)