The expression God the Father had never been revealed to anyone. When Moses himself asked God who he was, he heard another name. the Father's name has been revealed to us in the Son, for the name "Son" implies the new name "Father." 31
Catechism number 2781
When we pray to the Father, we are in communion with him and with his Son, Jesus Christ.33 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.