Roman Catechism 34.18

Chapter 34 — Part IV: Prayer — The Lord's Prayer: Introduction and Our Father Who Art in Heaven

Section 18. God Is Called Father Because He Has Granted Us Redemption — The creation of the world and God's providence are, then, of great weight in bringing into relief the singular love of God for the human race and the special care He takes of man. But far above these two shines the work of redemption, so much so indeed that our most bountiful God and Father has crowned His infinite goodness towards us by granting us this third favour.