"Blessed are they that mourn," and "woe unto them that laugh" [Matthew 5:4; Luke 6:25], says Christ. How then says Paul, "Rejoice in the Lord always"? "Woe to them that laugh," said Christ, the laughter of this world which arises from the things which are present. He blessed also those that mourn, not simply for the loss of relatives, but those who are pricked at heart, who mourn their own faults, and take count of their own sins, or even those of others. This joy is not contrary to that grief, but from that grief it too is born. For he who grieves for his own faults, and confesses them, rejoices. Moreover, it is possible to grieve for our own sins, and yet to rejoice in Christ. Since then they were afflicted by their sufferings, "for to you it is given not only to believe in him, but also to suffer for him" [Philippians 1:29], therefore he says, "Rejoice in the Lord." For this can but mean, If you exhibit such a life that you may rejoice. Or when your communion with God is not hindered, rejoice. Or else the word "in" may stand for "with": as if he had said, with the Lord. "Alway; again I will say, Rejoice." These are the words of one who brings comfort; as, for example, he who is in God rejoices always. Yea though he be afflicted, yea whatever he may suffer, such a man always rejoices. Hear what Luke says, that "they returned from the presence of the Council, rejoicing that they were counted worthy to be scourged for His name." [Acts 5:41] If scourging and bonds, which seem to be the most grievous of all things, bring forth joy, what else will be able to produce grief in us?
"Again I will say, Rejoice." Well has he repeated. For since the nature of the things brought forth grief, he shows by repeating, that they should by all means rejoice.
"Let your forbearance be known unto all men." He said above, "Whose god is the belly, and whose glory is in their shame," and that they "mind earthly things." [Philippians 3:19] It was probable that they would be at enmity with the wicked; he therefore exhorted them to have nothing in common with them, but to use them with all forbearance, and that not only their brethren, but also their enemies and opposers. "The Lord is at hand, in nothing be anxious." For why, tell me? Do they ever rise in opposition? And if you see them living in luxury, why are you in affliction? Already the judgment is near; shortly will they give account of their actions. Are ye in affliction, and they in luxury? But these things shall shortly receive their end. Do they plot against you, and threaten you? "In nothing be anxious." The judgment is already at hand, when these things shall be reversed. "In nothing be anxious." If you are kindly affected toward those who prepare evil against you, yet it shall not at last turn out to their profit. Already the recompense is at hand, if poverty, if death, if anything else that is terrible be upon you. "But in everything, by prayer and supplication, with thanksgiving, let your requests be made known unto God." There is this for one consolation, "the Lord is at hand." And again, "I will be with you always, even unto the end of the world." [Matthew 28:20] Behold another consolation, a medicine which heals grief, and distress, and all that is painful. And what is this? Prayer, thanksgiving in all things. And so He wills that our prayers should not simply be requests, but thanksgivings too for what we have. For how should he ask for future things, who is not thankful for the past? "But in everything by prayer and supplication." Wherefore we ought to give thanks for all things, even for those which seem to be grievous, for this is the part of the truly thankful man. In the other case the nature of the things demands it; but this springs from a grateful soul, and one earnestly affected toward God. God acknowledges these prayers, but others He knows not. Offer up such prayers as may be acknowledged; for He disposes all things for our profit, though we know it not. And this is a proof that it greatly profits, namely, that we know it not. "And the peace of God which passes all understanding shall guard your hearts and your thoughts in Christ Jesus." What means this? "The peace of God" which He has wrought toward men, surpasses all understanding. For who could have expected, who could have hoped, that such good things would have come? They exceed all man's understanding, not his speech alone. For His enemies, for those who hated Him, for those who determined to turn themselves away, for these, he refused not to deliver up His Only Begotten Son, that He might make peace with us. This peace then, i.e. the reconciliation, the love of God, shall guard your hearts and your thoughts.
For this is the part of a teacher, not only to exhort, but also to pray, and to assist by supplication, that they may neither be overwhelmed by temptations, nor carried about by deceit. As if he had said, May He who has delivered you in such sort as mind cannot comprehend, may He Himself guard you, and secure you, so that you suffer no ill. Either he means this, or that that peace of which Christ says, "Peace I leave with you, My peace I give unto you" [John 14:27]: this shall guard you, for this peace exceeds all man's understanding. How? When he tells us to be at peace with our enemies, with those who treat us unjustly, with those who are at war and enmity toward us; is it not beyond man's understanding? But rather let us look to the former. If the peace surpasses all understanding, much more does God Himself, who gives peace, pass all understanding, not ours only, but also that of Angels, and the Powers above. What means "in Christ Jesus"? Shall guard us in Him, so that you may remain firm, and not fall from His faith.
But look to this as the chief gain you are to make by them, that, in all due patience, ye may discharge the duties of your office religiously and piously-that is, in the love of Christ-and despise all transitory objects for the sake of His eternal promises. Which in truth surpass all human comprehension and understanding,
When the peace of God has come upon us, we shall understand God. There will be no discord, no disagreement, no quarrelsome arguments, nothing subject to question. This is hardly the case in worldly life. But it shall be so when we have the peace of God, wherein all understanding shall be ours. For peace is the state of being already at rest, already secure.
“The peace of God,” which he imparted to us, “passes all understanding.” For who could have expected and who could have hoped for such benefits? It transcends every human intellect and all speech. For his enemies, for those who hated him, for the apostates—for all these he did not refuse to give his only begotten Son, so as to make peace with them.… The peace which will preserve us is the one of which Christ says, “My peace I leave with you; my peace I give you.” For this “peace passes all human understanding.” How? When he sees that we should be at peace with enemies, with the unrighteous, with those who display contentiousness and hostility toward us, how does this not pass human understanding?
[AD 407] John Chrysostom on Philippians 4:4-7
"Again I will say, Rejoice." Well has he repeated. For since the nature of the things brought forth grief, he shows by repeating, that they should by all means rejoice.
"Let your forbearance be known unto all men." He said above, "Whose god is the belly, and whose glory is in their shame," and that they "mind earthly things." [Philippians 3:19] It was probable that they would be at enmity with the wicked; he therefore exhorted them to have nothing in common with them, but to use them with all forbearance, and that not only their brethren, but also their enemies and opposers. "The Lord is at hand, in nothing be anxious." For why, tell me? Do they ever rise in opposition? And if you see them living in luxury, why are you in affliction? Already the judgment is near; shortly will they give account of their actions. Are ye in affliction, and they in luxury? But these things shall shortly receive their end. Do they plot against you, and threaten you? "In nothing be anxious." The judgment is already at hand, when these things shall be reversed. "In nothing be anxious." If you are kindly affected toward those who prepare evil against you, yet it shall not at last turn out to their profit. Already the recompense is at hand, if poverty, if death, if anything else that is terrible be upon you. "But in everything, by prayer and supplication, with thanksgiving, let your requests be made known unto God." There is this for one consolation, "the Lord is at hand." And again, "I will be with you always, even unto the end of the world." [Matthew 28:20] Behold another consolation, a medicine which heals grief, and distress, and all that is painful. And what is this? Prayer, thanksgiving in all things. And so He wills that our prayers should not simply be requests, but thanksgivings too for what we have. For how should he ask for future things, who is not thankful for the past? "But in everything by prayer and supplication." Wherefore we ought to give thanks for all things, even for those which seem to be grievous, for this is the part of the truly thankful man. In the other case the nature of the things demands it; but this springs from a grateful soul, and one earnestly affected toward God. God acknowledges these prayers, but others He knows not. Offer up such prayers as may be acknowledged; for He disposes all things for our profit, though we know it not. And this is a proof that it greatly profits, namely, that we know it not. "And the peace of God which passes all understanding shall guard your hearts and your thoughts in Christ Jesus." What means this? "The peace of God" which He has wrought toward men, surpasses all understanding. For who could have expected, who could have hoped, that such good things would have come? They exceed all man's understanding, not his speech alone. For His enemies, for those who hated Him, for those who determined to turn themselves away, for these, he refused not to deliver up His Only Begotten Son, that He might make peace with us. This peace then, i.e. the reconciliation, the love of God, shall guard your hearts and your thoughts.
For this is the part of a teacher, not only to exhort, but also to pray, and to assist by supplication, that they may neither be overwhelmed by temptations, nor carried about by deceit. As if he had said, May He who has delivered you in such sort as mind cannot comprehend, may He Himself guard you, and secure you, so that you suffer no ill. Either he means this, or that that peace of which Christ says, "Peace I leave with you, My peace I give unto you" [John 14:27]: this shall guard you, for this peace exceeds all man's understanding. How? When he tells us to be at peace with our enemies, with those who treat us unjustly, with those who are at war and enmity toward us; is it not beyond man's understanding? But rather let us look to the former. If the peace surpasses all understanding, much more does God Himself, who gives peace, pass all understanding, not ours only, but also that of Angels, and the Powers above. What means "in Christ Jesus"? Shall guard us in Him, so that you may remain firm, and not fall from His faith.