The natural and the artificial.
Chuang Tzŭ said, "To know Tao is easy. The difficulty lies in the elimination of speech. To know Tao without speech appertains to the natural. To know Tao with speech appertains to the artificial. The men of old were natural, not artificial.
"Chu P'ing Man spent a large patrimony in learning under Chih Li I how to kill dragons.
To acquire Tao. There is no record of the persons mentioned.
By the end of three years he was perfect, but there was no direction in which he could show his skill.
Tao cannot be put into practice.
"The true Sage regards certainties as uncertainties; therefore he is never up in arms.
In a state of mental disturbance.