Angels are spirits, but it is not because they are spirits that they are angels. They become angels when they are sent. For the name angel refers to their office, not their nature. You ask the name of this nature, it is spirit; you ask its office, it is that of an Angel, which is a messenger.
Saint AugustineDo not wander far and wide but return into yourself. Deep within man there dwells the truth.
Saint AugustineThe true religion has always been one from the beginning, and will always be the same.
Saint AugustineWhoever, therefore, thinks that he understands the divine scriptures or any part of them so that it does not build on the double love of God and of our neighbor does not understand it at all. Thus a man supported by faith, hope, and charity, with an unshaken hold upon them does not need the scriptures. . . And many live by these three things in solitude without books.
Saint Augustine