"Hence the perfection of the universe requires that there should be intellectual creatures. Now to understand cannot be the action of a body, nor of any corporeal power.... Hence the perfection of the universe requires the existence of an incorporeal creature." (St. Thomas, Summa, 1a, 50). This small devotional book was compiled from various sources and offers meditations and prayers devoted to the Holy Angels. Most of the book was originally printed in the 1940s.