Professor Kreeft, why are angels important in the life of faith? Angels are part of the life of the Church.
[T]he whole life of the Church benefits from the mysterious and powerful help of angels. CCC 335 In her liturgy, the Church joins with the angels to adore the thrice-holy God. She invokes their assistance (in the Roman Canon’s Supplices te rogamus . . . [“Almighty God, we pray that your angel . . .”]; in the funeral liturgy’s In Paradisum deducant te angeli . . . [“May the angels lead you into Paradise . . .”]. Moreover, in the “Cherubic Hymn” of Byzantine Liturgy, she celebrates the memory of certain angels more particularly (St. Michael, St. Gabriel, St. Raphael, and the guardian angels). CCC 336 From infancy to death human life is surrounded by their watchful care and intercession. “Beside each believer stands an angel as protector and shepherd leading him to life.” Already here on earth the Christian life shares by faith in the blessed company of angels and men united in God.
Professor Kreeft, how do angels communicate with us?
Usually angels do not communicate directly with us but work behind the scenes, so to speak. Just as a lot of a play goes on behind the scenes, “in the wings”, so in your life a lot of the stuff that’s going on, a lot of the action, the spiritual warfare, is going on backstage, invisibly, “in the wings” of good and evil spirits. No one knows just how much, but it seems a safe bet that it’s a lot more than we dream of. When angels do communicate with us, it’s usually by suggesting things to our imagination—what we often call “inspiration”. However, although they may suggest certain thoughts or feelings or actions to us, neither good nor evil spirits can force our mind or will, which are free. (See questions 64 and 65.) Even God does not force his way in. He’s a gentleman. Thus our free will is both the most precious and the most dangerous gift of God. Angels can also communicate directly to our senses by assuming bodily form, though this is rare, like miracles. (See question 23.)