Сефер Йецира
In particular a Dor Dai is not bound to reject the theory of the ten Sefirot, as set out in the "Sefer Yetzirah". In the "Sefer Yetzirah", unlike in later Kabbalah, there is no question of the Sefirot being Divine entities or even attributes: they are simply the numerals, considered as the dimensional parameters used in the creation of the world.