Catechism of the Catholic Church
2670 "No one can say 'Jesus is Lord' except by the Holy Spirit." 21 Every time we begin to pray to Jesus it is the Holy Spirit who draws us on the way of prayer by his prevenient grace. Since he teaches us to pray by recalling Christ, how could we not pray to the Spirit too? That is why the Church invites us to call upon the Holy Spirit every day, especially at the beginning and the end of every important action.
If the Spirit should not be worshiped, how can he divinize me through Baptism? If he should be worshiped, should he not be the object of adoration? 22
2671 The traditional form of petition to the Holy Spirit is to invoke the Father through Christ our Lord to give us the Consoler Spirit. 23 Jesus insists on this petition to be made in his name at the very moment when he promises the gift of the Spirit of Truth. 24 But the simplest and most direct prayer is also traditional, "Come, Holy Spirit," and every liturgical tradition has developed it in antiphons and hymns.
Come, Holy Spirit, fill the hearts of your faithful and enkindle in them the fire of your love. 25
Heavenly King, Consoler Spirit, Spirit of Truth, present everywhere and filling all things, treasure of all good and source of all life, come dwell in us, cleanse and save us, you who are All Good. 26
2672 The Holy Spirit, whose anointing permeates our whole being, is the interior Master of Christian prayer. He is the artisan of the living tradition of prayer. To be sure, there are as many paths of prayer as there are persons who pray, but it is the same Spirit acting in all and with all. It is in the communion of the Holy Spirit that Christian prayer is prayer in the Church.
English Translation of the Cathechism of the Catholic Church for the United States of America © 1997, United States Catholic Conference, Inc.