The Wen-Tzu, also known as "the understanding of the mysteries of the Tao", is one of the great Taoist works.
It is supposed to have been written by a disciple of Lao-Tzu who had collected the teacher's words over two thousand years ago. The Wen-Tzu revolves around the state of wisdom, according to the teachings of the Tao Te King. (elartedelaestrategia.com)