Coriantumr had devoted a great deal of time to studying “all the arts of war and all the cunning of the world” (Ether 13:16); yet he rejected the simple message of Ether which would have brought him peace in a way that all his military skills could not do.
Note the prophet Ether’s promise to Coriantumr in verses 20 and 21, as well as its fulfillment (see Ether 15:1–3, 26–32, Omni 1:20–22).