Let love be, etc. Proceeding now to speak of particular duties, he fitly begins with love, which is the bond of perfection. And respecting this he enjoins what is especially necessary, that all disguises are to be cast aside, and that love is to arise from pure sincerity of mind. It is indeed difficult to express how ingenious almost all men are to pretend a love which they really have not, for they not only deceive others, but impose also on themselves, while they persuade themselves that those are not loved amiss by them, whom they not only neglect, but really slight. Hence Paul declares here, that love is no other but that which is free from all dissimulation: and any one may easily be a witness to himself, whether he has anything in the recesses of his heart which is opposed to love. [1] The words good and evil, which immediately follow in the context, have not here a general meaning; but evil is to be taken for that malicious wickedness by which an injury is done to men; and good for that kindness, by which help is rendered to them; and there is here an antithesis usual in Scripture, when vices are first forbidden and then virtues enjoined. As to the participle, apostugountes, I have followed neither Erasmus nor the old translators, who have rendered it "hating," (odio habentes;) for in my judgment Paul intended to express something more; and the meaning of the term "turning away," corresponds better with the opposite clause; for he not only bids us to exercise kindness, but even to cleave to it.

Footnotes

1 - "Love," says an old author, "is the sum and substance of all virtues. Philosophers make justice the queen of virtues; but love is the mother of justice, for it renders to God and to our neighbor what is justly due to them." -- Ed.

Let love - The apostle proceeds to specify the duties of Christians in general, that they might secure the beauty and order of the church. The first which he specifies is love. This word here evidently refers to benevolence, or to good-will toward all mankind. In Romans 12:10 he specifies the duty of brotherly love; and there can be no doubt that he here refers to the benevolence which we ought to cherish toward all people. A similar distinction is found in 2-Peter 1:7, "And to brotherly-kindness add charity," that is, benevolence, or good will, and kind feelings to others.
Without dissimulation - Without hypocrisy. Let it be sincere and unfeigned. Let it not consist in words or professions only, but let it be manifested in acts of kindness and in deeds of charity; 1-John 3:18; compare 1-Peter 1:22. Genuine benevolence is not what merely professes attachment, but which is evinced by acts of kindness and affection.
Abhor that which is evil - The word "abhor" means to hate; to turn from; to avoid. The word "evil" here has reference to malice, or unkindness, rather than to evil in general. The apostle is exhorting to love, or kindness; and between the direction to love all people, and the particular direction about brotherly love, he places this general direction to abhor what is evil; what is evil in relation to the subject under discussion, that is, malice or unkindness. The word "evil" is not infrequently used in this limited sense to denote some particular or special evil; Matthew 5:37, Matthew 5:39, etc.; compare Psalm 34:14; 2-Timothy 2:19; Psalm 97:10; 1-Thessalonians 5:22.
Cleave to that which is good - The word rendered "cleave" to denotes properly the act of gluing, or uniting firmly by glue. It is then used to denote a very firm adherence to an object; to be firmly united to it. Here it means that Christians should be firmly attached to what is good, and not separate or part from it. The good here referred to is particularly what pertains to benevolence - to all people, and especially to Christians. It should not be occasional only, or irregular; but it should be constant, active, decided.

Let love be without dissimulation - Ἡ αγαπη ανυποκριτος· Have no hypocritical love; let not your love wear a mask; make no empty professions. Love God and your neighbor; and, by obedience to the one and acts of benevolence to the other, show that your love is sincere.
Abhor that which is evil - Αποστυγουντες το πονηρον· Hate sin as you would hate that hell to which it leads. Στυγεω signifies to hate or detest with horror; the preposition απο greatly strengthens the meaning. Στυξ, Styx, was a feigned river in hell by which the gods were wont to swear, and if any of them falsified this oath he was deprived of his nectar and ambrosia for a hundred years; hence the river was reputed to be hateful, and στυγεω signified to be as hateful as hell. Two MSS. read μισουντες, which signifies hating in the lowest sense of the term. The word in the text is abundantly more expressive, and our translation is both nervous and appropriate.
Cleave to that which is good - Κολλωμενοι τῳ αγαθῳ· Be Cemented or Glued to that which is good; so the word literally signifies. Have an unalterable attachment to whatever leads to God, and contributes to the welfare of your fellow creatures.

(6) [Let] love be without dissimulation. Abhor that which is evil; cleave to that which is good.
(6) Now he comes to the duties of the second table of the ten commandments, which he derives from charity, which is as it were the fountain of them all. And he defines Christian charity as sincerity, hatred of evil, earnest study of good things, good affection to help our neighbour, and whose final goal is the glory of God.

Let love be without dissimulation,.... The apostle having given out suitable exhortations to the officers of this church, ministers and deacons, proceeds to stir up to the exercise of grace, and the discharge of such duties as were common to all the members of the church; and begins with "love", which is the cement of saints, and the bond of perfectness, without which all the gifts that men have, the profession they make, and works they do are of no avail, and they themselves nothing. Here it is to be taken, in the largest and most comprehensive sense, for love to God, Christ, the saints, and fellow creatures, and ought, with respect to each, to "be without dissimulation"; or "hypocrisy": love to God should be with all the heart, soul, and mind, otherwise the fear of him, and obedience to him, will be only outward, formal, customary, and hypocritical; love to Christ should be with sincerity, and so it is where it is right, hearty, and genuine; such can appeal to him as the searcher of hearts, that from the heart they love him; and love to one another should be not in word, and in tongue only, but in deed and in truth; yea, the love professed to fellow creatures, ought never to be through fear of men or mercenary views, but honest, upright, and sincere.
Abhor that which is evil; sin, both in its principle and in its actings; it being hateful to God, Father, Son, and Spirit, contrary to the nature, being, and perfections of God, a transgression of his righteous law, exceeding sinful in itself, and pernicious in its effects and consequences; for all which it is to be abhorred by the saints: the word here used, designs the greatest aversation imaginable, a turning away from it, as what is the most loathsome, detestable, and abominable; and such an hatred of it with horror, as of the Stygian lake, or hell itself:
cleave to that which is good; to God, who is originally, infinitely, and immutably good; who is good in his nature, and works, and to all his creatures, and especially his chosen people, and therefore should be cleaved unto; to his will, his ways, and worship; and to Christ the good shepherd of the sheep, the Lamb that is to be followed and cleaved unto, whithersoever he goes; and to the good Spirit of God, after whom we should walk, and not after the flesh; and to the good people of God, assembling with whom should not be forsaken; and to the good Gospel of Christ, and the truths of it, which should be held fast; and to the ordinances of the Gospel, which ought to be constantly attended on; and to every good work, to which we should be ready, careful to maintain, and ever follow, both among ourselves and all men: they should even be glued unto it, as the word here signifies.

The professed love of Christians to each other should be sincere, free from deceit, and unmeaning and deceitful compliments. Depending on Divine grace, they must detest and dread all evil, and love and delight in whatever is kind and useful. We must not only do that which is good, but we must cleave to it. All our duty towards one another is summed up in one word, love. This denotes the love of parents to their children; which is more tender and natural than any other; unforced, unconstrained. And love to God and man, with zeal for the gospel, will make the wise Christian diligent in all his wordly business, and in gaining superior skill. God must be served with the spirit, under the influences of the Holy Spirit. He is honoured by our hope and trust in him, especially when we rejoice in that hope. He is served, not only by working for him, but by sitting still quietly, when he calls us to suffer. Patience for God's sake, is true piety. Those that rejoice in hope, are likely to be patient in tribulation. We should not be cold in the duty of prayer, nor soon weary of it. Not only must there be kindness to friends and brethren, but Christians must not harbour anger against enemies. It is but mock love, which rests in words of kindness, while our brethren need real supplies, and it is in our power to furnish them. Be ready to entertain those who do good: as there is occasion, we must welcome strangers. Bless, and curse not. It means thorough good will; not, bless them when at prayer, and curse them at other times; but bless them always, and curse not at all. True Christian love will make us take part in the sorrows and joys of each other. Labour as much as you can to agree in the same spiritual truths; and when you come short of that, yet agree in affection. Look upon worldly pomp and dignity with holy contempt. Do not mind it; be not in love with it. Be reconciled to the place God in his providence puts you in, whatever it be. Nothing is below us, but sin. We shall never find in our hearts to condescend to others, while we indulge conceit of ourselves; therefore that must be mortified.

Let love be without dissimulation--"Let your love be unfeigned" (as in 2-Corinthians 6:6; 1-Peter 2:22; and see 1-John 3:18).
Abhor that which is evil; cleave to that which is good--What a lofty tone of moral principle and feeling is here inculcated! It is not, Abstain from the one, and do the other; nor, Turn away from the one, and draw to the other; but, Abhor the one, and cling, with deepest sympathy, to the other.

Let love be without dissimulation. Not a deceitful profession of love, but genuine; not like that of Judas to Christ, or Joab to Abner: a kiss and a stab.
Abhor that which is evil. Evil must be repulsive to the saint; good, on the other hand, attractive.
With brotherly love. The brotherhood of the saints was not a name only, but a real tie of tenderness and love; and each, in the spirit of true brotherhood, was to seek the honor of his Christian brother.
Not slothful in business. See the Revision. The idea is, "Give all diligence."
Fervent in spirit. Zealous, enthusiastic, not indifferent.
Serving the Lord. Whatever we find to do is to be done with our might, but above all, the service of Christ.
Rejoicing in hope. Hopeful, and hence rejoicing in the prospect.
Patient in tribulation. Patient in sorrow, suffering and persecution. Patience implies steadfastness.
In prayer. "Praying always and fainting not" (Luke 18:1).
Distributing. Making the needs of fellow saints your own and helping them.
Given to hospitality. This duty was especially needful in those early days when Christians were so often driven from their homes by persecution.

Having spoken of faith and its fruit, Romans 12:3, &c., he comes now to love. Abhor that which is evil; cleave to that which is good - Both inwardly and outwardly, whatever ill - will or danger may follow.