They have both Christ and the Spirit. Therefore, to say “if Christ is in you” or “if the Spirit is in you” has the same meaning.
The presence of the Spirit lets us understand the presence of Christ. The presence of Christ lets us understand the presence of the Spirit.
Not only this, but also the presence of the Father is understood, as Christ the Son of God assured us (see Jn 14:23). How great a mystery the Christian bears within himself.
“What then,” you ask, “will happen if Christ is in us? ‘The body is dead because of sin, but the spirit lives because of righteousness.’
Do you see how many evils come from not having the Holy Spirit within oneself? There is death, enmity against God, and the impossibility of pleasing Him by submitting to His laws.
There is also the impossibility of being Christ’s and having Him dwelling within oneself. See also how many blessings come from having the Spirit within oneself.
One truly belongs to Christ, has Christ Himself within oneself, and contends together with the angels. For to have the flesh dead to sin means to begin living eternal life.
It means, even here on earth, to bear within oneself the pledge of resurrection and the ease of walking the path of virtue.
The Apostle did not simply say, ‘the body is dead.’ He added, ‘because of sin,’ so that you may understand that vice is put to death, not the nature of the body.
The Apostle is not speaking of that. On the contrary, he wants the body to be dead while remaining alive.
When our bodies, in regard to carnal impulses, differ in no way from bodies lying in the grave, this is a sign that we have the Son within us, and that the Spirit abides in us” (St. Chrysostom).
As darkness cannot stand before light, so the carnal, passionate, and sinful cannot stand before Christ the Lord and His Spirit. Yet the existence of the sun does not abolish the existence of darkness.
So also the presence in us of the Son and the Spirit does not abolish the existence in us of something sinful and passionate. It only takes away its strength.
The passionate and sinful element, as soon as an occasion appears, immediately comes forward and offers itself to consciousness and free will. If consciousness pays attention to it and occupies itself with it, free will may also incline there.
But if consciousness and free will at that moment pass over to the side of the spirit and turn to Christ the Lord and His Spirit, then everything carnal and passionate immediately vanishes.
It disappears like smoke before the breath of the wind. This is what it means that the flesh is dead and powerless.
Such is the universal law of the life of true Christians. Yet there are degrees. When a man remains without ceasing, in consciousness and free will, on the side of the spirit, he is in living and perceptible communion with Christ the Lord in His Spirit.
At that time the carnal and passionate cannot even show itself, as darkness cannot before the sun, and cold cannot before flame. Here the flesh is entirely dead and unmoving.
This is the degree which St. Paul means in the present passage. St. Macarius of Egypt often depicts this degree.
The general order of the spiritual life is best described by Venerable Hesychius. The essence of his instructions is this.
When the flesh and passion rise up, turn away from them by inattention, contempt, and aversion. Then turn in prayer to Christ the Lord, Who is within you.
Both the carnal and the passionate will at once depart.
“But the spirit lives because of righteousness.” In Greek it does not say “lives,” but “life”: “the spirit is life because of righteousness.”
Here “spirit” means the human spirit, whose nature is life in God through attention and free will. This life consists in devotion to Him and zealous pleasing of Him through strict fulfillment of His will, or His commandments.
This is righteousness. Life because of righteousness is the nature of the spirit.
Thus to say, “then the spirit is life because of righteousness,” is the same as saying that our spirit then becomes what it ought to be according to nature.
It becomes life because of righteousness, and is restored to its own rank.
If we add to this the thought that what is passionate and sinful in body and soul is something foreign and additional to nature, then the Apostle’s meaning becomes clear.
In the one in whom Christ is present with His Spirit, that foreign element is made dead.
Thus in these few words the Apostle has described the state of the person in whom fallen human nature has been restored from the fall to its natural rank, in spirit, soul, and body.
In this way one may see here a summary of the whole discourse on the restoration of the fallen man. In chapter 7 he described the lamentable state of the fallen man under the tyranny of sin dwelling in him.
The Apostle came to the question, “Who will deliver me?” By the answer, “I thank my God through Jesus Christ,” he confessed that he had already been delivered, and indicated by Whom he was delivered (Rom 7:24-25).
After explaining the whole course of deliverance in the first verses of chapter 8, he concludes it in the present verse.
He says, in effect, that this is the life finally established in man: “the body is dead because of sin, but the spirit lives because of righteousness.”
This is the ordering of human life intended in creation. But is the whole restorative power in Christ Jesus exhausted by this? No.
For man is still left under the appearance of corruption, and all nature is still subject to vanity. Full restoration requires that these unseemly conditions also be removed.
And they will indeed be removed in their own time. St. Paul now proceeds to indicate this.
Before this he explained the manner of restoration. Now he wishes to describe the scope of this restoration, both in man himself and in visible nature.