“Tolerance has never provoked civil wars; intolerance has covered the earth with carnage.”Voltaire · Dicționar filozofic · 1764 · Tolérance
Tolerance has never killed; intolerance turns natural disagreement into slaughter.
Voltaire writes after centuries of religious wars and draws a direct historical comparison: societies that permitted different beliefs lived in peace, those that enforced a single truth produced massacres. The mechanism is clear: intolerance turns disagreement, which is natural, into an existential conflict where the other must be eliminated. The Algerian civil war of the 1990s or ethnic genocides rest on exactly this logic of impossible purity.
Voltaire flips a common intuition: disagreement is not a threat, but the normal condition of people who think. The danger comes not from the fact that we differ, but from the demand that everyone believe alike. Once difference is declared guilty, there is no way back. A simple example: neighbors with opposite political views still borrow salt from each other, as long as neither claims the other deserves punishment for what he believes. Intolerance is precisely that claim, moved to the scale of the state. Then disagreement becomes treason, and treason demands punishment. The question that follows: why do some feel that another person believing differently destroys their own truth?
Why it matters Relevant to debates about extremism: history shows that imposing beliefs, not coexistence, kills.