5,6. The Moral Law causes the people to be in complete accord with their ruler, so that they will follow him regardless of their lives, undismayed by any danger.

from Sun Tzu – Laying Plans on Rap Genius

Meaning

Essentially, a people must believe in the causes for going to war. To go to war without the proper moral backing (or, I should say, proper in the context of the society. i.e Society A may need religious justification for war, while Society B may need Humanitarian justification) runs the chance of your cause loosing steam midway through.

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