Yetzer Hara

The yetzer hara, the evil inclination, is the rabbinic name for the impulse in a person toward self-serving desire and transgression. The term is built out of Genesis 6:5 and 8:21, where "the inclination of the thoughts of the human heart" is described as evil from youth, and the rabbis developed it into a standing feature of their moral psychology, paired with the yetzer tov, the good inclination.

What is distinctive in the rabbinic treatment is its refusal to make the yetzer hara simply an enemy. It is created by God and belongs to a creation pronounced very good; the midrash reads "behold, it was very good" as including the evil inclination, on the ground that "were it not for the yetzer hara, no one would build a house, marry, have children or engage in business" (Genesis Rabbah 9:7). A well-known aggadah has the sages capture the inclination toward idolatry and then discover that no egg is laid in the whole land, so that they blind it rather than destroy it (Yoma 69b). The impulse, on this account, is appetite and drive as such, misdirected rather than intrinsically corrupt, and not removable without removing what makes human life go.

The prescribed response is therefore mastery rather than eradication: through Torah study, which the Talmud calls the antidote (Kiddushin 30b), through the discipline of the commandments, and through the exercise of choice, which the tradition consistently affirms a person actually has. The evil inclination is held to be present from the beginning of life and the good inclination to arrive later, at the age of obligation.

This anthropology is the usual point of contrast with Christian doctrines of original sin. Rabbinic Judaism affirms a persistent and universal inclination toward wrongdoing without holding that human nature is fallen, that guilt is inherited, or that a person is unable to choose otherwise. Later ethical literature elaborated the struggle in great detail, the Musar movement made it a programme of self-examination, and Shneur Zalman's Tanya restructured it as two souls, animal and divine, contending for the same body.

Beyond the general prescription of Torah study as an antidote, a specific Talmudic passage (Berakhot 5a) sets out four sequential remedies for a person struggling against the evil inclination, cited in later ethical literature as a practical program rather than a merely theoretical account.

The first remedy is to incite the good inclination against the evil inclination, read as directing a person to consciously marshal reasoned resolve against the impulse rather than hoping it passes. If that fails, the second remedy is to occupy oneself with Torah study, on the premise, stated elsewhere in rabbinic literature, that sustained engagement with sacred text crowds out and weakens the appetite it is set against. If study alone does not suffice, the third remedy is to recite the Shema, invoking the declaration of God's unity as a direct verbal counterweight to a divided, appetite-driven will. And if even that fails, the passage prescribes a fourth remedy: to remind oneself of the day of death, on the reasoning that few desires survive close contemplation of one's own mortality, since most transgression trades a lasting fact for a passing satisfaction that only looks attractive when death is kept out of view.

Later ethical writers, particularly in the Musar movement founded by Israel Salanter in the nineteenth century, built entire disciplines of habituation and reflection on this Talmudic sequence, treating it as evidence that rabbinic Judaism required concrete, escalating technique rather than willpower alone, an emphasis Musar writers contrasted with what they saw as an excessive reliance on intellectual study divorced from deliberate character work.