13. Under all conditions, however, the doctrine of unity remained free from outward compulsion and full of intrinsic vigor and freshness. There was still room for differences of opinion, such as whether God's life, power, wisdom, and unity are attributes--distinct from His being, and qualifying it,--or whether they are inherent in His nature, comprising His very essence. This controversy aimed to determine the conception of God, either by Aristotelian rationalism, as represented by Maimonides, or by the positive religious assumptions of Crescas and others.
This is Maimonides' statement of the unity: "God is one; that is, He is unlike any other unit, whether made one in point of numbers or species, or by virtue of composition, separation, and simplification. He is one in Himself, there being no multiplicity in Him. His unity is beyond all definition."(222)
Ibn Gabirol in his "Crown of Royalty" puts the same thought into poetic form: "One art Thou; the wise wonder at the mystery of Thy unity, not knowing what it is. One art Thou; not like the one of dimension or number, as neither addition nor change, neither attribute nor quality affects Thy being. Thou art God, who sustainest all beings by Thy divinity, who holdest all creatures in Thy unity. Thou art God, and there is no distinction between Thy unity, Thy eternity, and Thy being. All is mystery, and however the names may differ, they all tell that Thou art but one."(223)
14. Side by side with this rationalistic trend, Judaism always contained a current of mysticism. The mystics accepted literally the anthropomorphic pictures of the Deity in the Bible, and did not care how much they might affect the spirituality and unity of God. The philosophic schools had contended against the anthropomorphic views of the older mystics, and thus had brought higher views of the Godhead to dominance; but when the rationalistic movement had spent its force, the reaction came in the form of the Cabbalah, the secret lore which claimed to have been "transmitted" (according to the meaning of the word) from a hoary past. The older system of thought had stripped the Deity of all reality and had robbed religion of all positiveness; now, in contrast, the soul demanded a God of revelation through faith in whom might come exaltation and solace.(224)