Roman Catechism 35.4

Chapter 35 — Part IV: Prayer — The First Petition: Hallowed Be Thy Name

Section 4. Object Of The First Three Petitions — But as our desires and petitions concern such things only as are needed, and as nothing can be added to God; that is to say. to the Divine Nature, nor can His Divine Substance, which is ineffably rich in all perfection, be in any way increased, we must remember that the things we ask of God on God's own account are extrinsic and concern His exterior glory.