In Judaism, yetzer hara (Hebrew: יֵצֶר הַרַע yēṣer haraʿ) is the congenital inclination to do evil, by violating the will of God. The term is drawn from the phrase "the imagination of the heart of man [is] evil" (יֵצֶר לֵב הָאָדָם רַע, yetzer lev-ha-adam ra).
In traditional Judaism, the yetzer hara is not a demonic force, but rather man's misuse of things the physical body needs to survive. Thus, the need for food becomes gluttony due to the yetzer hara. The need for procreation becomes promiscuity, and so on.
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