Some excerpts from the first few chapters of The Conquest of Illusion
The mystery of life
by J.J. Van Der Leeuw (1929)
p. 9 The mystery of life is not a problem to be solved, it is a reality to be experienced.
p. 18 We live and move and have our being in the world of our consciousness and it is the only world we know directly, all else we know through it. This means that all knowledge except that of our own consciousness is derived knowledge; we experience an awareness in our consciousness and thence derive the existence of something that has produced the awareness.