Its pretty abstract about it but to paraphrase:

Fighter: A brawler, someone who fights for non ideological reasons, not to say without reason at all.

Soldier: Someone who fights for the overall good of the state, will fight and die to defend his worldly beliefes.

Warrior: someone who fights for the defense of their spiritual or moral beliefs, generally hopes to transcend "lesser conflict"

note: this is not to say any of these 3 seek out conflict, just the conflict of choice and how they respond to it.

this is a hard book to understand, it was transalated and not very well either, but I really like it, gets me a thinkin on stuff like this. I may have misinterperated it but i think thats the jist of it.

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Soldiers Die Saints