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Finally, brethren, farewell,.... Or "rejoice", with spiritual joy in Christ, their Saviour and Redeemer; in his person, in whom they were accepted; in his righteousness, by which they were justified; in his blood, by which they were washed and cleansed; and in his fulness, from which they were supplied; and particularly, that they had such a faithful monitor, such an hearty well wisher of their souls' welfare, and who was so naturally and affectionately concerned for their good:

be perfect; seek after perfection in knowledge, grace, and holiness, and in the performance of good works: or "be restored"; or jointed and knit together, as before; see 2 Corinthians 13:9 let every difference subside, all breaches be made up, every member take and fill up his place, and all things be done decently and in order:

be of good comfort; or "exhort" one another to the diligent discharge of duty, to love and good works; or comfort one another in all distresses, inward and outward, both by words and deeds, according to the ability God has given; or take comfort, be of good heart, do not refuse to be comforted either by God or men.

Be of one mind; in religious sentiments, in the doctrines and principles of grace, and ordinances of the Gospel; for as there is but "one Lord" to be believed in, so there is, and ought to be, but "one" system of "faith" to be received, and "one baptism" to be administered in one and the same way, to one and the same sort of persons; which sameness of judgment, in faith and worship, is very necessary to church communion, and the comfort of it; for how can two, and much less more, walk comfortably together, unless they are agreed in these things?

Live in peace both with them that are without, and them that are within, with all men, and with the members of the church; which to do, is to the credit of religion, the comfort of church members, and the joy of Christ's ministers:

and the God of love and peace shall be with you; he who is love itself, and has loved his people with an everlasting love, and who is the author and donor of spiritual and eternal peace, and who has called his people to peace, and expects and requires it among themselves, and all men, will grant to such his gracious presence; than which nothing can be more grateful and desirable.

Finally, brethren - (λοιπὸν loipon). The remainder; all that remains is for me to bid you an affectionate farewell. The word here rendered “farewell” (χαίρετε chairete), means usually to joy and rejoice, or to be glad; Luke 1:14; John 16:20, John 16:22; and it is often used in the sense of “joy to you,” “hail!” as a salutation; Matthew 26:49; Matthew 27:29. It is also used as a salutation at the beginning of an epistle, in the sense of greeting; Acts 15:23; Acts 23:26; James 1:1. It is generally agreed, however, that it is here to be understood in the sense of farewell, as a parting salutation, though it may be admitted that there is included in the word an expression of a wish for their happiness. This was among the last words which Cyrus, when dying, addressed to his friends.

Be perfect - See this word explained in the notes on 2 Corinthians 13:9, and Romans 9:22. It was a wish that every disorder might be removed; that all that was out of joint might be restored; that everything might be in its proper place; and that they might be just what they ought to be: A command to be perfect, however, does not prove that it has ever in fact been obeyed: and an earnest wish on the part of an apostle that others might be perfect, does not demonstrate that they were; and this passage should not be adduced to prove that any have been free from sin. It may be adduced, however, to prove that an obligation rests on Christians to be perfect, and that there is no natural obstacle to their becoming such, since God never can command us to do an impossibility. Whether anyone, but the Lord Jesus, has been perfect, however, is a question on which different denominations of Christians have been greatly divided. It is incumbent on the advocates of the doctrine of sinless perfection to produce some one instance of a perfectly sinless character. This has not yet been done.

Be of good comfort - Be consoled by the promises and supports of the gospel. Take comfort from the hopes which the gospel imparts. Or the word may possibly have a reciprocal sense, and mean, comfort one another; see Schleusner. Rosenmuller renders it, “receive admonition from all with a grateful mind, that you may come to greater perfection.” It is, at any rate, the expression of an earnest wish on the part of the apostle, that they might be happy.

Be of one mind - They had been greatly distracted, and divided into different parties and factions. At the close of the Epistle he exhorts them as he had repeatedly done before, to lay aside these strifes, and to be united, and manifest the same spirit; see the notes on Romans 12:16; Romans 15:5, note; see the note also on 1 Corinthians 1:10, note. The sense is, that Paul desired that dissensions should cease, and that they should be united in opinion and feeling as Christian brethren.

Live in peace - With each other. Let contentions and strifes cease. To promote the restoration of peace had been the main design of these epistles.

And the God of love and peace - The God who is all love, and who is the Author of all peace. What a glorious appellation is this! There can be no more beautiful expression, and it is as true as it is beautiful, that God is a God of love and of peace. He is infinitely benevolent; He delights in exhibiting His love; and He delights in the love which His people evince for each other. At the same time, He is the Author of peace, and He delights in peace among people. When Christians love each other they have reason to expect that the God of love will be with them; when they live in peace, they may expect the God of peace will take up His abode with them. In contention and strife we have no reason to expect His presence; and it is only when we are willing to lay aside all animosity that we may expect the God of peace will fix his abode with us.