The true radicalism here lies not in tolerating disagreement—anyone can manage that when they feel secure—but in defending the *right* of those whose words genuinely offend you, whose arguments seem dangerous, whose very voice makes you angry. Voltaire understood that free speech's greatest test comes not with popular speech but unpopular speech, not with ideas we find merely wrong but those we find repugnant. When social media platforms today struggle with content moderation, they're wrestling with exactly this tension: the difference between having the power to silence voices and having the wisdom to preserve the principle that protects everyone's ability to speak. The quote asks us something harder than mere tolerance—it asks whether we believe in freedom enough to protect it even when it costs us something.