Definition
Cognitive dissonance is the discomfort produced by holding two or more beliefs, values, or commitments that contradict one another. In psychology it is typically framed as a flaw — a pressure people resolve by changing one belief, rationalizing the conflict, or avoiding the evidence that exposes it.
Harari's contribution is to treat dissonance not as a bug to be cured but as a structural feature of every successful culture. Cultures, he argues, must hold incompatible ideals at the same time — freedom and equality, mercy and justice, faith and reason — and the friction between them is what drives the culture to evolve.
Why it matters
How it works
At the individual level, dissonance feels like discomfort; people resolve it by editing belief or behavior. At the cultural level, dissonance is permanent because the contradictory commitments are coded into shared fictions — laws, scriptures, constitutions — that no individual can quietly rewrite. The contradiction outlives the people who first noticed it, and successive generations attempt to reconcile it in new ways. Each reconciliation is a step of cultural evolution.