Chapter 40 of the Tao Teh Ching introduces the idea of the Incorporeal.
Chapter 34 of the Tao Teh Ching explains the innate greatness of the Tao.
Chapter 25 of the Tao Teh Ching alluding to the origin of all things and the great four in the Universe.
Passage 15 of the Tao Teh Ching by Lao Tzu translated by John C.H. Wu that describes the ancient adepts of the Tao.