Remember upon the conduct of each depends the fate of all.

The line frames collective success as the sum of individual discipline: a community, army, or polity survives only if each person acts with responsibility. It implies a moral and strategic interdependence—one person’s negligence can endanger everyone—while also granting dignity to the individual by making their conduct consequential. Read as a leader’s admonition, it functions as both motivation and warning: loyalty, courage, and self-control are not private virtues but public necessities. The sentiment fits ancient military rhetoric about cohesion and shared risk, even if the precise wording is likely a later formulation.