{4} If ye fulfil the {f} royal law according to the scripture, Thou shalt love thy neighbour as thyself, ye do well:

(4) The conclusion: charity which God prescribes cannot agree with the respecting of people, seeing that we must walk in the king's highway.

(f) The law is said to be royal and like the king's highway, in that it is simple and without changes, and that the law calls everyone our neighbour without respect, whom we may help by any kind of duty.

People's New Testament

2:8 The royal law according to the scripture. The law of love for one's neighbor (Le 19:8), which is the fulfillment of the law. See Ga 5:14.

Wesley's Notes

2:8 If ye fulfil the royal law - The supreme law of the great King which is love; and that to every man, poor as well as rich, ye do well. Lev 19:18.

Jamieson-Fausset-Brown Bible Commentary

8. The Greek may be translated, "If, however, ye fulfil," &c., that is, as Alford, after Estius, explains, "Still I do not say, hate the rich (for their oppressions) and drive them from your assemblies; if you choose to observe the royal law . well and good; but respect of persons is a breach of that law." I think the translation is, "If in very deed (or 'indeed on the one hand') ye fulfil the royal law . ye do well, but if (on the other hand) ye respect persons, ye practice sin." The Jewish Christians boasted of, and rested in, the "law" (Ac 15:1; 21:18-24; Ro 2:17; Ga 2:12). To this the "indeed" alludes. "(Ye rest in the law): If indeed (then) ye fulfil it, ye do well; but if," &c.

royal-the law that is king of all laws, being the sum and essence of the ten commandments. The great King, God, is love; His law is the royal law of love, and that law, like Himself, reigns supreme. He "is no respecter of persons"; therefore to respect persons is at variance with Him and His royal law, which is at once a law of love and of liberty (Jas 2:12). The law is the "whole"; "the (particular) Scripture" (Le 19:18) quoted is a part. To break a part is to break the whole (Jas 2:10).

ye do well-being "blessed in your deed" ("doing," Margin) as a doer, not a forgetful hearer of the law (Jas 1:25).

Matthew Henry's Concise Commentary

2:1-13 Those who profess faith in Christ as the Lord of glory, must not respect persons on account of mere outward circumstances and appearances, in a manner not agreeing with their profession of being disciples of the lowly Jesus. St. James does not here encourage rudeness or disorder: civil respect must be paid; but never such as to influence the proceedings of Christians in disposing of the offices of the church of Christ, or in passing the censures of the church, or in any matter of religion. Questioning ourselves is of great use in every part of the holy life. Let us be more frequent in this, and in every thing take occasion to discourse with our souls. As places of worship cannot be built or maintained without expense, it may be proper that those who contribute thereto should be accommodated accordingly; but were all persons more spiritually-minded, the poor would be treated with more attention that usually is the case in worshipping congregations. A lowly state is most favourable for inward peace and for growth in holiness. God would give to all believers riches and honours of this world, if these would do them good, seeing that he has chosen them to be rich in faith, and made them heirs of his kingdom, which he promised to bestow on all who love him. Consider how often riches lead to vice and mischief, and what great reproaches are thrown upon God and religion, by men of wealth, power, and worldly greatness; and it will make this sin appear very sinful and foolish. The Scripture gives as a law, to love our neighbour as ourselves. This law is a royal law, it comes from the King of kings; and if Christians act unjustly, they are convicted by the law as transgressors. To think that our good deeds will atone for our bad deeds, plainly puts us upon looking for another atonement. According to the covenant of works, one breach of any one command brings a man under condemnation, from which no obedience, past, present, or future, can deliver him. This shows us the happiness of those that are in Christ. We may serve him without slavish fear. God's restraints are not a bondage, but our own corruptions are so. The doom passed upon impenitent sinners at last, will be judgment without mercy. But God deems it his glory and joy, to pardon and bless those who might justly be condemned at his tribunal; and his grace teaches those who partake of his mercy, to copy it in their conduct.