2,500 years ago, the Chinese philosopher Confucius asked Lao-tzu, the founder of Taoism, "What is Tao?" Lao-tzu opened his mouth but said nothing. Confucius left with a smile, but his students were puzzled. Confucius explained, "Lao-tzu has passed us the Tao. In his mouth, there are no teeth but only a tongue.
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