CATECHISM OF THE CATHOLIC CHURCH
SECOND EDITION

Paragraphs 446–449

446 In the Greek translation of the Old Testament, the ineffable Hebrew name YHWH, by which God revealed himself to Moses, is rendered as Kyrios, "Lord". From then on, "Lord" becomes the more usual name by which to indicate the divinity of Israel's God. The New Testament uses this full sense of the title "Lord" both for the Father and - what is new - for Jesus, who is thereby recognized as God Himself.
447 Jesus ascribes this title to himself in a veiled way when he disputes with the Pharisees about the meaning of Psalm 110, but also in an explicit way when he addresses his apostles. Throughout his public life, he demonstrated his divine sovereignty by works of power over nature, illnesses, demons, death and sin.
448 Very often in the Gospels people address Jesus as "Lord". This title testifies to the respect and trust of those who approach him for help and healing. At the prompting of the Holy Spirit, "Lord" expresses the recognition of the divine mystery of Jesus. In the encounter with the risen Jesus, this title becomes adoration: "My Lord and my God!" It thus takes on a connotation of love and affection that remains proper to the Christian tradition: "It is the Lord!"
449 By attributing to Jesus the divine title "Lord", the first confessions of the Church's faith affirm from the beginning that the power, honor and glory due to God the Father are due also to Jesus, because "he was in the form of God", and the Father manifested the sovereignty of Jesus by raising him from the dead and exalting him into his glory.