Lao Tzu means 'Old Master.' Tradition places him in China around the 6th century BCE, a record keeper in the royal court of Zhou. Whether he was one man, many, or a composite of sages is one of the oldest open questions in scholarship.
The story is that as the dynasty declined he rode west on a water buffalo to disappear into the mountains. At the border a guard refused to let him pass until he wrote down his teaching. The 81 short chapters that resulted became the Tao Te Ching — the book of the Way and its virtue.
It is the second most translated text in human history, after the Bible. Every generation since has found itself in it.
