Dewarim 30:15 Kabbala: Zohar

The friends asked, If so, why all this? Rabbi Shimon replied: If the Holy One, blessed be He, had not created the Evil and Good Inclinations, which are light and darkness, there would not have been any precepts or transgressions for the man of Briyah. So man was created with both, as it is written: "See, I have set before you this day life and good, and death and evil" (Devarim 30:15). They asked him: why all this? Better He had not created darkness. Then man would have no reward or punishment as opposed to being created and having to sin, thereby causing much (damage and destruction).