When he fulfills these conditions, the peace of God through the Lord Jesus Christ overshadows him and fills his whole inner being.
There is a path to this peace, and one must walk it in order to taste it. Since not every believer walks it, or has not yet walked it completely, not everyone tastes this peace.
Therefore the Apostle desires that all should taste it, and that it should overshadow all. He desires that all should be counted worthy of this ineffable blessing by fulfilling everything required for it.
“May it guard” means: may it keep, protect, and be a watchman. This also gives the thought that the Apostle is expressing not a good wish, but the consequence of what came before.
It is as though he says: do everything prescribed, and the peace of God will surround you and be your guard.
If peace is the consequence, then all that precedes is the means to it. What then?
When you overcome every self-pleasing and enter the way of the cross through unsparing self-denial, when you extinguish every irritability in yourself and clothe yourselves in meekness, then peace comes.
When you cast away evil anxiety and surrender your souls, bodies, and your whole temporal and eternal lot into the hands of the Lord, peace comes.
He is near you and in you, and is present in all things. When in everything, at every time, in every place, and in every circumstance you rise to God in warm, reverent, undistracted prayer, then God’s peace will overshadow you.
It will guard your hearts and your understandings. In other words: drive out self-pleasing, irritability, and evil care, and you will drive out everything that disturbs.
Surrender yourself to the Lord and stand before Him in prayer. Then you will receive everything that calms and brings peace.
The consequence is clear: the peace of God will guard you. So long as the passions are not overcome, and the soul has not found rest in God, do not expect God’s peace.
Perhaps it will visit from time to time, to draw you by its sweetness further and further along your good path.
When the peace of God comes, it will guard hearts and understandings. “Understandings” means concepts, thoughts, and reflections. “Hearts” means feelings and dispositions.
In our usual state, thoughts jostle like specks of frost. The heart is constantly agitated, now under the influence of thoughts, now by the demands of self-pleasing, irritability, and care.
The more these enemies of ours are tamed, the quieter the heart becomes and the less thoughts boil over. When they are completely driven out, the heart becomes wholly calm and thoughts settle down.
Yet this happens only when, in departing from one thing, the soul attaches itself to another. Neither thoughts nor the heart can exist without activity and feelings.
As we wean them from one thing, we must at the same time accustom them to another, opposite thing. This accustoming produces that weaning.
The Apostle explains in the following verse exactly what we should accustom them to. Here let us say: to everything divine.
The divine, even while being in ceaseless activity, remains in peace. This peace surpasses every mind. Because it is ineffable, it cannot be brought into ordinary concepts or described to another so that he understands.
It can only be tasted. The one who tastes it understands it, but he cannot compare it with anything in order to explain it.
It also surpasses every mind because it comes apart from the mind. The mind does not know how to attain it. It is given, but how and why is incomprehensible.
It is given “in Christ Jesus.” Only true Christians can have it. The only path to it is the true Christian faith.
Whoever realizes this faith within himself becomes one spirit with the Lord Jesus Christ. Through Him he becomes one with the Godhead.
To taste the peace of God is the same as to taste communion with God. When God communicates Himself to the human spirit, the spirit is overshadowed by peace.
God is the God of peace. Communion with God takes place only in the Lord Jesus Christ, by the path preserved by the Orthodox faith alone.