The sources of our knowledge of the kabalistic doctrines are the books of Yetzirah and Zohar, the former drawn up in the second century, and the latter a little later; but they contain materials much older than themselves...In them, as in the teachings of Zoroaster, everything that exists emanates from a source of infinite Light.

Morals and Dogma (ed. Simon and Schuster, 2013) - ISBN: 9781625584625