Tarrou is the one who says this, late in The Plague, and it is one of the most demanding confessions in the book. Up to this point, the novel has framed the disease as an outside enemy. There are doctors fighting it. Citizens enduring it. Authorities trying to manage it. Tarrou’s statement collapses the distance. The plague is not only out there. It is in every one of us.

He does not mean the literal microbe. He means the capacity to do harm, the willingness to consent to harm done in our name, the small daily betrayals of others that we hardly notice. The clerk who follows the rule that will ruin a family. The bystander who looks away. The neighbor who repeats the rumor. None of these people see themselves as carriers of the plague, and that is precisely the point.

This is not a counsel of despair. Tarrou keeps fighting after he says it. The honesty about the plague within is what makes the fight serious. If the disease were only out there, you could defeat it once and rest. Because it is also in here, the struggle has to continue every day, inside your own mind. You watch what you breathe out into the world.

If revolt is the refusal to join forces with pestilence, then the first place to look for the pestilence is in yourself. Tarrou is not letting anyone, including himself, off the hook.