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To explain the "Analects of Confucious" passage; In Judo and Karate the highest level possible ( which has never been awarded) is a white belt-A white belt is what a beginner wears-the ultimate white belt is twice the width of the beginner's belt- This signifies "Original innocence"- in other words you are just as innocent of what you have learned, as a beginner. I other words: you know what you are capable of, so you have no need to prove this to anyone- others can tell what you know by your output, without being informed.