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When you know a thing, to hold that you know it; and when you do not know a thing, to acknowledge that you do not know it — this is knowledge. The most dangerous kind of ignorance is the kind that does not know itself. I have been called a sage, but what I know, chiefly, is how much I do not know. My students think this is modesty. It is not modesty. It is the most important thing I have taught them.