Kabbalah su Deuteronomio 6:5

Beside this there are other commandments which cannot be properly fulfilled without knowledge of Torah and of this wondrous science. These [commandments] are the love and fear of God. They are commandments addressed to us in the Torah. [Concerning] love, it is written, You will love the Lord your God (Deut. 6:5). [Of] fear it is written, You will fear the Lord your God (Deut. 6:13, 10:20). If one does not comprehend the awesome majesty of His divinity, His separation from the rest of the existents, the origin of all that exists from Him as well as the number of degrees which exist until [His] providence reaches this lowly world, how can one fear Him?

Rabbi Simeon rejoiced and said: “O Lord, I have heard your report and am afraid (Hab. 3:2). There it is proper to be fearful. We [, however,] depend upon love. Thus it is written: You will love your fellow as yourself (Lev. 19:18). You will love the Lord your God (Deut. 6:5, 11:1). And I have loved you, says the Lord (Mal. 1:2).”

Rabbi Yitzchak, the son of Rabbi Yosi, traveled from Cappadocia to Lod, where he met Rabbi Yehuda. Rabbi Yitzchak asks him, Why are the companions, the sages of the Mishnah, not aroused in this matter of removing the Evil Inclination from the world, except at the time of mating? He replied, Upon your life! The world needs the Evil Inclination as much as it needs rain, because without the Evil Inclination there would not be the joy of study in the world. But it also would not be as corrupted as it was before, which caused sinning. This is the meaning of the verse, "They shall not hurt or destroy in all My holy mountain" (Isaih 11:9). Rabbi Shimon said, "My holy mountain" is the heart," the dwelling place of the Evil Inclination. Rabbi Eliezer said, A good heart is the foundation of the body and soul. For that reason, it is written, "And you shall love Hashem your Elohim with all your heart" (Devarim 6:5), for the heart is the essence of all!