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 AugustineDid my infancy succeed another age of mine that dies before it? Was it that which I spent within my mother's womb?... And what before that life again, O God of my joy, was I anywhere or in any body?
Saint AugustineYou don't love in your enemies what they are, but what you would have them become by your prayers.
Saint Augustine