Roman Catechism 34.11

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

Section 11. The historical part of Sacred Scripture, as we have already remarked, is full of such examples, all of which go to show the extent of the benefits bestowed by God on man through the ministry and intervention of Angels whom He deputes not only on particular and private occasions, but also appoints to take care of us from our very births. He furthermore appoints them to watch over the salvation of each one of the human race.