Augustine of Hippo : The "law of Christ" means the law of love. The one who loves his neighbor fulfills the law. The love of neighbor is strongly commended even in the Old Testament. The apostle elsewhere says that it is by love that all the commands of the law are summed up. If so, then it is evident that even that Scripture which was given to the covenant people was the law of Christ, which, since it was not being fulfilled by fear, he came to fulfill by love. The same Scripture, therefore, and the same law is called the old covenant when it weighs down in slavery those who are grasping after earthly goods. It is called the new testament when it raises to freedom those who are ardently seeking the eternal good. — EPISTLE TO THE Galatians 58 [1B.6.2] Clement of Alexandria : However, both the laws served the Word for the instruction of humanity, both that given by Moses and that by the apostles. What, therefore, is the nature of the training by the apostles, appears to me to require to be treated of. Under this head, I, or rather the Instructor by me, will recount; and I shall again set before you the precepts themselves, as it were in the germ. ... "If we live in the Spirit, let us walk in the Spirit. Let us not be desirous of vainglory, provoking one another, envying one another. Bear ye one another's burdens, and so fulfil the law of Christ. Be not deceived; God is not mocked. Let us not be weary in well-doing: for in due time we shall reap, if we faint not." — The Instructor Book 3 Ignatius of Antioch : I Exhort thee in God, that thou add [speed] to thy course, and that thou vindicate thy dignity. Have a care to preserve concord with the saints. Bear [the burdens of] the weak, that "thou mayest fulfil the law of Christ." — Epistle of Pseudo-Ignatius to Hero, a Deacon of Antioch Jerome : Sin is a burden, as the psalmist affirms. … This burden the Savior bore for us, teaching by his life what we ought to do. He himself bears our iniquities and grieves for us and invites those who are cast down by the burden of sin and the law to take up the light yoke of virtue. Therefore the one who does not demean his brother's salvation extends his hand as needed. So far as it lies within him he weeps with him as he weeps; he shares the neighbor's weakness. He counts another's sins as his own. Such is the one who fulfills the law of Christ through love. — EPISTLE TO THE Galatians 3.6.2 Jerome : (Vers. 2.) Carry one another's burdens, and thus fulfill the law of Christ. For sin is a burden, and the Psalmist testifies, saying: My iniquities have risen above my head, like a heavy burden weighing me down (Psalms 38:5). And Zechariah, in a vision, saw a weighty lead covering of iniquity (Zechariah 5). The Savior took this burden upon Himself for us, teaching us by His example what we ought to do. For indeed he carries our iniquities, and he grieves for us, and he invites those who are burdened by the weight of sins and the Law to the light burden of virtue, saying: My yoke is easy, and my burden is light. Therefore, whoever does not despair of his brother's salvation, but extends a hand to the one who prays, and as much as he can, weeps with the one who weeps, is weak with the weak, and judges his own sins as those of others, such a person fulfills the law of Christ through charity. What is the law of Christ? This is my commandment, that you love one another (John 13:34). What is the law of the Son of God? Love one another, as I have loved you. How did the Son of God love us? Greater love has no one than this, that someone lay down his life for his friends (John 15:13). Whoever does not have compassion, nor is clothed with the bowels of mercy and tears, although he may be spiritual, will not fulfill the law of Christ. But let us also connect this place with the previous ones. For we follow a twofold understanding. If someone is weak in faith and is still nourished with the milk of infancy, they cannot so quickly transition from legal observance to the spiritual sacraments: you who are stronger, bear their burdens, lest your knowledge cause your brother to stumble, for whom Christ died. Also bear the need of your brother, who aids the burdened poor with the weight of destitution, and makes friends for himself with unjust money (Luke 16), whom Christ addresses after his resurrection: Come to me, blessed of my Father: possess the kingdom prepared for you from the foundation of the world. For I was hungry, and you gave me something to eat; I was thirsty, and you gave me something to drink (Matthew 25:34, 35). According to this meaning, Paul, teaching Timothy in another Epistle, added: Command those who are rich in this present world not to be conceited or to put their hope in wealth, which is so uncertain, but to put their hope in God, who richly provides us with everything for our enjoyment. Command them to do good, to be rich in good deeds, and to be generous and willing to share. In this way they will lay up treasure for themselves as a firm foundation for the coming age, so that they may take hold of the life that is truly life (1 Timothy 6:17-19). He who grasps true life, surely the one who speaks: I am the life (John 14:6), fulfills the law of Christ, which aims at life. — Commentary on Galatians John Chrysostom : "Bear ye one another's burdens." It being impossible for man to be without failings, he exhorts them not to scrutinize severely the offences of others, but even to bear their failings, that their own may in turn be borne by others. As, in the building of a house, all the stones hold not the same position, but one is fitted for a corner but not for the foundations, another for the foundations, and not for the corner so too is it in the body of the Church. The same thing holds in the frame of our own flesh; notwithstanding which, the one member bears with the other, and we do not require every thing from each, but what each contributes in common constitutes both the body and the building. "And so fulfil the law of Christ." He says not "fulfil," but, "complete;" that is, make it up all of you in common, by the things wherein ye bear with one another. For example, this man is irascible, thou art dull-tempered; bear therefore with his vehemence that he in turn may bear with thy sluggishness; and thus neither will he transgress, being supported by thee, nor wilt thou offend in the points where thy defects lie, because of thy brother's forbearing with thee. So do ye by reaching forth a hand one to another when about to fall, fulfil the Law in common, each completing what is wanting in his neighbor by his own endurance. But if ye do not thus, but each of you will investigate the faults of his neighbor, nothing will ever be performed by you as it ought. For as in the case of the body, if one were to exact the same function from every member of it, the body could never consist, so must there be great strife among brethren if we were to require all things from all. — Homily on Galatians 6 Oecumenius : "Bear one another's burdens." Since there is no person without sin, he urges not to be demanding toward the sins of one's neighbor, as knowing that you too have sins, and that we must behave toward one another with mutual consideration. — [PHOTIUS] For the law of Christ was therefore demonstrated through his works: for he indeed took up our sins and bore our diseases. (Isa. 53:4-5; Matt. 8:17) And the excess, that he also accepted the cross and death for us. [end of the Photius excerpt] — — [OECUMENIUS] Or that to bear one another's burdens and weaknesses is thereby the fulfilling of the law of Christ, insofar as it is done out of love. Love is the fulfillment of the divine law. (Rom. 13:10) [end of the excerpt by Oecumenius] — — Commentary on Galatians Origen of Alexandria : By "burdens" he means the needs of the body. So to the extent that anyone is richer in resources, he is called to bear the poor person's burden and relieve poverty by his abundance. — COMMENTARY ON Romans 10.6 Tertullian : The Creator's law, therefore, has received the approval of the rival god, who has, in fact, bestowed upon it not the sentence of a summary dismissal, but the favour of a compendious acceptance; the gist of it all being concentrated in this one precept! But this condensation of the law is, in fact, only possible to Him who is the Author of it. When, therefore, he says, "Bear ye one another's burdens, and so fulfill the law of Christ," since this cannot be accomplished except a man love his neighbour as himself, it is evident that the precept, "Thou shalt love thy neighbour as thyself" (which, in fact, underlies the injunction, "Bear ye one another's burdens"), is really "the law of Christ," though literally the law of the Creator. — Against Marcion Book V Theodoret of Cyrus : This means: "You have one deficiency but not another. The neighbor's case is the opposite. He has another deficit but not the one you have. You must bear his and he yours. For thus is the law of love fulfilled." By "the law of Christ" he means love, for he himself said, "I give you a new commandment, to love one another." — EPISTLE TO THE Galatians 6.2