An old woman who was stationed at the circulation desk at the library, when I happened to be checking out a book that was not about angels, but that had the word angel in the title, told me, when she saw the cover, as she scanned the barcode and printed a receipt to hand to me, that once, when she’d been going through a difficult time, she’d had an encounter with an angel, though she had not realized that’s what the being had been until many years later, when she’d recalled it.