Meaning

Voltaire is drawing a direct line between the acceptance of irrational ideas and the capacity for extreme violence. When people surrender their critical judgment to a belief system, a leader, or an ideology without examining it carefully, they become capable of justifying acts they would otherwise find unthinkable. The point is not that belief itself is dangerous, but that belief accepted without scrutiny removes the internal check that normally limits destructive behavior.

Context

This line appeared in a work Voltaire published in 1765 dealing with questions of miracles and religious belief. Throughout his career he argued that uncritical acceptance of doctrine, whether religious or political, posed a genuine threat to human welfare. He saw the history of organized persecution as evidence for this view, and he used his writing to push back against the kind of authoritative certainty that demands compliance rather than inviting thought. The quote captures one of his deepest and most consistent concerns.

About the author

Voltaire was the pen name of Francois-Marie Arouet, a French Enlightenment writer and philosopher born in 1694. He was among the most influential public intellectuals of eighteenth-century Europe, producing a vast body of work that used satire, history, philosophy, and correspondence to promote reason and religious tolerance. His critiques of superstition and tyranny made him celebrated in some quarters and dangerous in others. He died in 1778, leaving behind a legacy that shaped liberal and humanist thought for generations.