9. The churchmen have attempted often enough to harmonize the dualism or trinitarianism of Christianity with the monotheism of the Bible. Still Judaism persists in considering such an infringement upon the belief in Israel's one and only God as really a compromise with heathenism. “A [pg 087] Jew is he who opposes every sort of polytheism,” says the Talmud.[218]
10. The medieval Jewish thinkers therefore made redoubled efforts to express with utmost clearness the doctrine of God's unity. In this effort they received special encouragement from the example of the leaders of Islam, whose victorious march over the globe was a triumph for the one God of Abraham over the triune God of Christianity. A great tide of intellectual progress arose, lending to the faith of the Mohammedans and subsequently also to that of the Jews an impetus which lasted for centuries. The new thought and keen research of that period had a lasting influence upon the whole development of western culture. An alliance was effected between religion and philosophy, particularly by the leading Jewish minds, which proved a liberating and stimulating force in all fields of scientific investigation. Thus the pure idea of monotheism became the basis for modern science and the entire modern world-view.[219]
11. The Mohammedan thinkers devoted their attention chiefly to elucidating and spiritualizing the God idea, beginning as early as the third century of Islamism, so to interpret the Koran as to divest God of all anthropomorphic attributes and to stress His absolute unity, uniqueness, and the incomparability of His oneness. Soon they became familiar with neo-Platonic and afterward with Aristotelian modes of speculation through the work of Syrian and Jewish translators. With the help of these they built up a system of theology which influenced Jewish thought also, first in Karaite and then in Rabbanite circles.[220] Thus sprang up successively the philosophical systems of Saadia, Jehuda ha Levi, Ibn Gabirol, Bahya, Ibn Daud, and Maimonides. The philosophical hymns and the articles of faith, both of which found a place in the liturgy [pg 088] of the Synagogue, were the work of their followers. The highest mode of adoring God seemed to be the elaboration of the idea of His unity to its logical conclusion, which satisfied the philosophical mind, though often remote from the understanding of the multitude. For centuries the supreme effort of Jewish thought was to remove Him from the possibility of comparison with any other being, and to abolish every conception which might impair His absolute and simple unity. This mental activity filled the dwellings of Israel with light, even when the darkness of ignorance covered the lands of Christendom, dispelled only here and there by rays of knowledge emanating from Jewish quarters.[221]
12. The proofs of the unity of God adduced by Mohammedan and Jewish thinkers were derived from the rational order, design, and unity of the cosmos, and from the laws of the mind itself. These aided in endowing Judaism with a power of conviction which rendered futile the conversionist efforts of the Church, with its arguments and its threats. Israel's only One proved to be the God of truth, high and holy to both the mind and the heart. The Jewish masters of thought rendered Him the highest object of their speculation, only to bow in awe before Him who is beyond all human ken; the Jewish martyrs likewise cheerfully offered up their lives in His honor; and thus all hearts echoed the battle-cry of the centuries, “Hear O Israel, the Lord our God, the Lord is One,” and all minds were illumined by the radiant hope, “The Lord will be King of the earth; on that day the Lord shall be One, and His name shall be One.”
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 [pg 089] 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 [pg 090] contrast, the soul demanded a God of revelation through faith in whom might come exaltation and solace.[224]
Nevertheless the Maimonidean articles of faith were adopted into the liturgy because of their emphasis on the absolute unity and indivisibility of God, by which they constituted a vigorous protest against the Christian dogma. Judaism ever found its strength in God the only One, and will find Him ever anew a source of inspiration and rejuvenation.