An extensive empire must be supported by a refined system of policy and oppression; in the centre, an absolute power, prompt in action and rich in resources; a swift and easy communication with the extreme parts; fortifications to check the first effort of rebellion; a regular administration to protect and punish; and a well-disciplined army to inspire fear, without provoking discontent and despair.
Edward Gibbon[The] events by which the fate of nations is not materially changed, leave a faint impression on the page of history, and the patience of the reader would be exhausted by the repetition of the same hostilities [between Rome and Persia], undertaken without cause, prosecuted without glory, and terminated without effect.
Edward Gibbon