And thus far concerning the constitution, nature, and right of sovereigns, and concerning the duty of subjects, derived from the principles of natural reason. And now, considering how different this doctrine is from the practice of the greatest part of the world, especially of these western parts, that have received their moral learning from Rome and Athens; and how much depth of moral philosophy is required, in them that have the administration of the sovereign power; I am at the point of believing this my labour as useless as the commonwealth of Plato. For he also is of opinion that it is impossible for the disorders of state, and change of governments by civil war, ever to be taken away, till sovereigns be philosophers.