It may be affirmed without exaggeration that a just and unprejudiced estimate of Judaism is found nowhere in modern Christian writings. - Kaufmann Kohler

A clear and concise definition of Judaism is very difficult to give, for the reason that it is not a religion pure and simple based upon accepted creeds, like Christianity or Buddhism, but is one inseparably connected with the Jewish nation as the depository and guardian of the truths held by it for mankind. Furthermore, it is as a law, or system of laws, given by God on Sinai that Judaism is chiefly represented in Scripture and tradition, the religious doctrines being only implicitly or occasionally stated.

Judaism, parent of both Christianity and Islam, holds forth the pledge and promise of the unity of the two.

At any rate, Judaism, while insisting upon the unity of God and His government of the world, recognizes alongside of God no principle of evil in creation. God has no counterpart either in the powers of darkness, as the deities of Egypt and Babylon had, or in the power of evil, such as Ahriman in the Zoroastrian religion is, whose demoniacal nature was transferred by the Gnostic and Christian systems to Satan. In the Jewish Scriptures Satan has his place among the angels of heaven, and is bound to execute the will of God, his master.