To study angels is to shed light on ourselves, especially those aspects of ourselves that have been put down in our secularized civilizations, our secularized educational systems, and even our secularized worship system. By secularization, I mean anything that sucks the awe out of things.
The word "humility" (also "human") is derived from the Latin "humus," meaning "the soil." Perhaps this is not simply because it entails stooping and returning to earthly origins, but also because, as we are rooted in this earth of everyday life, we find in it all the vitality and fertility unnoticed by people who mostly tramp on across the surface, drawn by distant landscapes.