"It is a very true and expressive phrase, "He looked daggers at me," for the first pattern and prototype of all daggers must have been a glance of the eye.... It is wonderful how we get about the streets without being wounded by these delicate and glancing weapons, a man can so nimbly whip out his rapier, or without being noticed carry it unsheathed. Yet it is rare that one gets seriously looked at."

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In Shakespeare Saved My Life, [author Laura Bates] said she got better papers from [prisoners] than she got from people in her regular classes. Because she was teaching, of course, Macbeth, and a number of them had murdered people. The guy who wrote the best paper said, "You do have this, 'Is this a dagger which I see before me?' before you do it, but in my case it was a gun."

— Margaret Atwood