S=L/E is the Telios stability equation: Stability equals Leverage divided by Entropy. Leverage (L) is the rate of entropy export—actions that increase viable future states. Entropy (E) is the rate of entropy generation—waste, disorder, coordination cost. When S > 1, the system is regenerative. When S = 1, sustainable. When S < 1, degenerative. When S < 0.15, collapse is inevitable. This equation applies universally to individuals, organizations, AI systems, and civilizations.