When we pray to the Father, we are in communion with him and with his Son, Jesus Christ. Then we know and recognize him with an ever new sense of wonder. The first phrase of the Our Father is a blessing of adoration before it is a supplication. For it is the glory of God that we should recognize him as "Father," the true God. We give him thanks for having revealed his name to us, for the gift of believing in it, and for the indwelling of his Presence in us.
Source: Catechism of the Catholic Church (Vatican.va)