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If one has to jump a stream and knows how wide it is, he will not jump. If he does not know how wide it is, he will jump, and six times out of ten he will make it.
He who knows he who knows not, and knows not that he knows not, is a fool, shun him; He who knows not, and knows that he knows not, is a child, teach him. He who knows, and knows ...
Every man goes down to his death bearing in his hands only that which he has given away.
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