What Plato understood, centuries before we had terminology for it, is that stagnation isn't merely the absence of improvement—it's active deterioration. We tend to think of decline as something that requires effort, when in truth, standing still is what demands the most from us over time. A musician who stops practicing doesn't maintain her skill; she loses it. A mind that stops wrestling with ideas doesn't preserve its sharpness; it dulls. The uncomfortable truth Plato offered is that preservation itself requires motion, that "good condition" is not a state we reach and then inhabit peacefully, but rather something we must continually recreate through engagement.