“Zohar-kabbalah is heresy of the most pernicious kind. Yet it is a fact that this kind of mystic pantheism exercises a curious appeal to very clever people whose customary approach to thought is soberly rational. By a remarkable paradox, the current of speculation which was to carry Spinoza out of Judaism brought him to pantheism too, so that he was the end-product both of the rationalism of Maimonides and the anti-rationalism of his opponents.”