CCC 2055

When someone asks him, "Which commandment in the Law is the greatest?"⁸ Mt 22:36. Jesus replies: "You shall love the Lord your God with all your heart, and with all your soul, and with all your mind. This is the greatest and first commandment. and a second is like it: You shall love your neighbor as yourself. On these two commandments hang all the Law and the prophets."⁹ Mt 22:37-40; cf. Deut 6:5; Lev 19:18. The Decalogue must be interpreted in light of this twofold yet single commandment of love, the fullness of the Law:

the commandments: "You shall not commit adultery, You shall not kill, You shall not steal, You shall not covet," and any other commandment, are summed up in this sentence: "You shall love your neighbor as yourself." Love does no wrong to a neighbor; therefore love is the fulfilling of the law.¹⁰ Rom 13:9-10.