Why You Do Things You Know You Shouldn’t | Rachana Kamtekar on Plato’s Moral Psychology

• Plato, as interpreted by Cornell scholar Rachana Kamtekar, offers a radical rethinking of why we do things we know we shouldn’t—arguing that we never truly act against our knowledge of the good, but are instead misled by appearances, and that moral failure is always a kind of mistake, not a willful choice.
  • This challenges common assumptions about self-sabotage, temptation, and moral responsibility, and has deep implications for how self-improvement works: if virtue is knowledge, then teaching should suffice; but Plato ultimately argues virtue requires both teaching and practice, since non-rational parts of the soul must be trained, not just informed.

Socrates’ Core Claim: No One Acts Against Knowledge of the Good

• In the Protagoras, Socrates argues that a person never acts contrary to what they know is best—a view that seems to contradict everyday experience (e.g., eating ice cream despite knowing it’s unhealthy).
  • His analogy: just as visual appearances can deceive us (a distant person looks smaller), so too can pleasures appear more desirable than they are. When we “give in,” we’re not overriding knowledge—we’re being misled by appearance.
  • Knowledge, for Socrates, is like a scientific measurement: it corrects appearances. If you truly know the long-term harm, you won’t act against it. If you do act against it, your judgment was governed by appearance, not knowledge.
  • This doesn’t deny that people make bad choices—it reframes them as errors in judgment, not failures of will.

Competing Theories of Moral Failure

• Desire for the bad: Some thinkers (e.g., Augustine, Nietzsche, Freud) suggest people sometimes choose evil because it is evil—Augustine stole pears “because it was wrong”; Nietzsche posits a drive for cruelty.

  • Plato would question these introspective reports: such explanations may reflect ideology (e.g., original sin) rather than true motivation.
  • Socrates’ counter-argument (from the Meno): all desire is for what appears good. Even when we pursue harmful things, we do so under the guise of good—e.g., the “bad boy” aesthetic appeals because rebellion seems admirable or exciting.
  • The appearance of badness can be part of what makes something seem good (e.g., thrill, social status), but the underlying aim is still perceived benefit.

• Hyper-rationalism: The Stoics claim all action requires assent to a proposition—implying constant rational deliberation.

  • Plato rejects this: not every action involves conscious reasoning. Hunger drives eating without calculation.
  • But he maintains that even non-rational motivations (appetite, honor) are oriented toward the good—they pursue limited goods (pleasure, recognition) that serve survival or social functioning.
  • Reason’s role is not to micromanage but to guide and correct these impulses over time through habituation and education.

• Sloth or weakness of will: The idea that someone knows the good but lacks the willpower to act (e.g., a lazy friend who won’t pursue his calling).

  • Plato denies a single “will” faculty. Instead, the soul has three parts: reason, spirit, and appetite.
  • Apparent laziness reflects appetite (desire for comfort) overpowering reason—not a weak will, but a conflict between motivational centers.
  • Spirit (the social, honor-seeking part) can support reason (e.g., shame about overeating), but appetite operates independently and can dominate.

• Overpowering by pleasure: The common view that pleasure “overwhelms” better judgment.

  • Socrates attacks this in the Protagoras—but only when pleasure is seen as the only good (hedonism). If more pleasure is always better, how can less pleasure “overpower” more?
  • The problem isn’t overpowering per se, but the assumption of value monism. In Plato’s richer psychology, different values (pleasure, honor, truth) compete, and one can override another.
  • So overpowering happens—not because pleasure defeats reason directly, but because appetite (seeking immediate pleasure) overrides reason’s long-term judgment.

Plato’s Tripartite Soul

• Plato divides the soul into three functional parts:

  • Reason: seeks truth and the overall good; capable of deliberation.
  • Spirit (thumos): responsive to honor, shame, social judgment; naturally allies with reason.
  • Appetite: bodily desires (hunger, thirst, sex); aims at immediate pleasure, not long-term good.

• These parts explain internal conflict:

  • Conflict arises when the same object is both desired and avoided (e.g., drinking when thirsty but knowing it’s harmful).
  • Mere incompatibility (wanting to eat and sleep) doesn’t create deep conflict—only opposition to the same object does.
  • Spirit supports reason but can appear to rebel (e.g., choosing prestige over art). Yet Plato argues spirit always requires reason’s “rubber stamp”—it internalizes socially recognized values, which are ultimately shaped by reason.
    • Example: someone in investment banking for status has convinced themselves (via reason) that wealth is the good—they’re not purely driven by spirit.
    • Spirit can be redirected by reason (e.g., anger dissipates when given an explanation), showing its responsiveness to rational input.

• Reason rules not by force but by persuasion:

  • In the just soul, reason persuades the other parts by showing them how to achieve their truest pleasures.
    • Appetite may be denied sex but gains stable, long-term bodily well-being—better on its own terms.
    • Spirit gains genuine honor through virtue, not mere social approval.
  • This doesn’t mean appetite is always satisfied—it may be “mutilated” (e.g., desires exiled) to achieve its best possible state.

Wrongdoing Is Unwilled

• Socrates claims no one does wrong willingly (akon)—because all action aims at the good, and wrongdoing harms the agent’s soul.

  • “Unwilled” doesn’t mean causally unfree—it means contrary to one’s deepest desire (for the good).
  • This is not about free will or determinism, but about motivation: wrongdoing stems from ignorance, not malice.

• Moral responsibility is reframed:

  • People are causally responsible for their actions, but not deserving of blame.
  • The proper response to wrongdoing is pity and correction, not retribution.
    • Blame is counterproductive (causes defensiveness); shame can be productive (motivates self-improvement).
    • Punishment should be rehabilitative, not punitive—its goal is to restore psychic harmony.

• Legal and educational implications:

  • Plato’s ideal legal system aims at correction, deterrence, and reconciliation—not revenge.
  • Even in unjust systems, punishment can have unintended benefits (e.g., prison preventing further crime).
  • Socrates’ refusal to escape execution (in the Crito) reflects his belief that breaking his agreement with Athens would damage his soul more than death—even though he was innocent.

Implications for Self-Improvement

• Virtue cannot be taught like a subject—it requires practice, habituation, and shaping of non-rational desires.
  • Education includes musical and physical training to discipline appetite.
  • Reason guides by setting long-term goals and correcting appearances, but must work with spirit (e.g., using shame constructively).
• Self-sabotage is not a failure of will, but a misalignment between parts of the soul—often due to appetite being misled by immediate appearances.
• Lasting change comes from transforming desires, not just changing beliefs.