John Chrysostom
What does "Finally, brethren, rejoice" mean? You have grieved them, frightened them, cast them into sorrow, and made them tremble and fear. How then do you command them to rejoice?
"For this very reason," he says, "I command you to rejoice. If you, on your part, correspond to what I must do on my part, there will be no obstacle to joy.
"On my part everything has been done. I was long-suffering, delayed, did not cut you off, persuaded, exhorted, frightened, and threatened, so that somehow I might produce the fruits of repentance in you.
"Now you must do your part, and your joy will not be darkened."
"Be perfected." What does "Be perfected" mean? Be perfect, and supply what is lacking.
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"Be comforted." Since the temptations were many and the dangers great, seek consolation in one another, in us, and in your own correction.
If your joy comes from a pure conscience, and if you are perfect, nothing is lacking for your courage and consolation. Nothing brings so much comfort as a pure conscience, even if you are surrounded by countless temptations.
"Be of one mind, live in peace." He asked this also at the beginning of the first epistle. It can happen that people have the same thoughts and yet have no peace.
For example, they may agree in the dogmas of faith, yet be hostile toward one another. Paul, however, requires both here, oneness of mind and concord.
"And the God of love and peace will be with you." He not only exhorts and counsels them to have peace, but also prays to God for this.
Indeed, here he either prays or foretells the future. More precisely, he does both together.
"If," he says, "you act in this way, that is, if you think the same thing and have peace among yourselves, then God will be with you.
"For God is the God of love and peace. He rejoices in this and delights in it. From this, from His love, peace will also be in you.
"From this comes deliverance from all evils. This love saved the whole world. It ended the ancient enmity on earth. It united earth with heaven. It made men angels.
"Let us also love it, for it is the mother of countless blessings. By it we have been saved, and through it all ineffable blessings have been granted to us."