CATECHISM OF THE CATHOLIC CHURCH
SECOND EDITION

Paragraphs 2074–2077

2074 Jesus says: "I am the vine, you are the branches. He who abides in me, and I in him, he it is that bears much fruit, for apart from me you can do nothing." The fruit referred to in this saying is the holiness of a life made fruitful by union with Christ. When we believe in Jesus Christ, partake of his mysteries, and keep his commandments, the Savior himself comes to love, in us, his Father and his brethren, our Father and our brethren. His person becomes, through the Spirit, the living and interior rule of our activity. "This is my commandment, that you love one another as I have loved you."
2075 "What good deed must I do, to have eternal life?" - "If you would enter into life, keep the commandments" (Mt 19:16-17).
2076 By his life and by his preaching Jesus attested to the permanent validity of the Decalogue.
2077 The gift of the Decalogue is bestowed from within the covenant concluded by God with his people. God's commandments take on their true meaning in and through this covenant.