Video from The Thomistic Institute
“To pretend they [Angels] do not exist because we do not see them is like pretending that we never sleep because we have never caught ourselves asleep.” -Fr. Walter Farrell, O.P. The Catholic church firmly teaches the existence of angels, both good and bad ones. It is based on faith in divine revelation, but God has revealed to us the reality of angels and demons. And by doing so, He is telling us something intelligible and wonderful. So, we want to understand the angels as much as possible, in order to understand the ways of God and the ways of the spiritual life. Angels and Demons (Aquinas 101) - Fr. James Brent, O.P." from video introduction.