Catechism Part 1, Section 2, Chapter 2, Article 2, IV: Lord (446-451)

In the Old Testament, "Lord" was used more often than the divine name YHWH to indicate God's divinity. 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  demonstrates his divine sovereignty by works of power over nature, illness, demons, death, and sin. Very often in the Gospels people address Jesus as Lord. This title refers to the respect and trust 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 the title becomes adoration. It thus takes on a connotation of love and affection that remains proper to the Christian tradition. By attributing to Jesus the divine title Lord the first confession of the Churches faith affirm from the beginning that the power, honour, and glory due to God the Father are also due to  Jesus because  he was in the from of God and the Father manifested the sovereignty of Jesus by raising him from the dead and exalting him into his glory. From the beginning of Christian history, the assertion of Christ's lordship over the world and over history has implicitly recognized that man should not submit his personal freedom in an absolute manner to any earthly power , but only to God  the Father and the Lord Jesus Christ. The Church believes that the key , the center and the purpose of the whole of man's history is to be found in its Lord and Master. Christian prayer is characterized by the title Lord whether in the invitation to prayer( The Lord be with you)_, its conclusion(through Christ our Lord), or the exclamation full of trust and hope ( Our Lord come!), or (Come Lord!) Amen. Come, Lord Jesus!