The Zohar explains the term "Ein Sof" as follows: “ Before He gave any shape to the world, before He produced any form, He was alone, without form and without resemblance to anything else. Who then can comprehend how He was before the Creation? Hence it is forbidden to lend Him any form or similitude, or even to call Him by His sacred name, or to indicate Him by a single letter or a single point... But after He created the form of the Heavenly Man, He used him as a chariot wherein to descend, and He wishes to be called after His form, which is the sacred name "YHWH". ” In other words, "Ein Sof" signifies "the nameless being." In another passage the Zohar reduces the term to "Ein" (non-existent), because God so transcends human understanding as to be practically non-existent. In addition to the Sefer Yetzirah and the Zohar, other well-known explications of the relation between Ein Sof and all other realities and levels of reality have been formulated by the Jewish mystical thinkers of the Middle Ages, such as Isaac the Blind and Azriel. Judah Ḥayyaṭ, in his commentary Minḥat Yehudah on the Ma'areket Elahut, gives the following explanation of the term "Ein Sof": “ Any name of God which is found in the Bible can not be applied to the Deity prior to His self-manifestation in the Creation, because the letters of those names were produced only after the emanation. . . . Moreover, a name implies a limitation in its bearer; and this is impossible in connection with the 'Ein Sof.' http://en.wikipedia.org/wiki/Ein_Sof So we see that God is real.