Now, generalship involves three ideas: caution, enterprise, and the union of the two. And each of these consists of three things, acting as they do either by word, or by deeds, or by both together. And all this can be accomplished either by persuasion, or by compulsion, or by inflicting harm in the way of taking vengeance on those who ought to be punished; and this either by doing what is right, or by telling what is untrue, or by telling what is true, or by adopting any of these means conjointly at the same time.