Every angel is terrifying. And yet, alas, I invoke you, one of the soul's lethal raptors, well aware of your nature. As in the days of Tobias, when one of you, obscuring his radiance, stood at the simple threshold, appearing ordinary rather than appalling while the curious youth peered through the window. ('Rilke's Second Elegy' by Rainer Maria Rilke, loose translation by Michael R. Burch)