He who knows not and knows not that he knows not, but thinks that he knows, is a fool – leave him alone. He who knows not, and knows that he knows not, is a child – teach him. He who knows, but knows not he knows, is asleep – wake him. He who knows, and knows that he knows, and uses what he knows, is a leader – follow him. — Willie Jolley (paraphrasing a German proverb)

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