Fighting a War with a Moral Justification
To wage a war, one must have a legitimate cause, just as we ought to have such a reason in doing all things. The term has two meanings. The first is that moral justification is a source of strength when waging a war. With moral justification, the troops will have high morale and strength in fighting. Without it, it would be difficult to command the troops. The second meaning is that war must not be waged without a just cause. Greed or anger should not be allowed to lead to militarism and aggression. The underlying notion of this concept is that war can only be fought with a just cause, which represents the spirit of civilization.
A military campaign must have a moral justification. (The Book of Rites)
Those who have virtue thrive; those who go against virtue perish. If a war is waged without moral justification, it will not succeed. (The History of the Han Dynasty)
I hope the voice of justice will be heard everywhere. Be bold and confident when fighting a just war. When a military campaign has a moral justification, great victory can be achieved. (Zhu Ding: A Tale of a Jade Dressing Table)