Peace for any prolonged period of time is impossible. Humans have a natural thirst for chaos and war is the most readily available form of chaos.
That path leads ever down into stagnation.
The basic lesson of our relativistic universe is that things change. Any power must always meet a greater power.
The problem of leadership is inevitably: Who will play God?" Muad'Dib
His voice was low, charged with unspeakable adjectives.
What you cannot control, you must accept.