God has control over the earth. He can command the earth and it obeys. He can command the ocean, and it will obey. He can curse inanimate objects, and they are cursed. We should not be surprised that he may also curse man, and “it shall be done.” Mormon is again highlighting the promise of destruction that comes with iniquity. God made the promise. He promised prosperity upon righteousness, and it happened. So too will the penalty for unrighteousness.