When we can see immediate and dramatic results of true faith and diligence, we are prone to humbly acknowledge them and give thanks to the great Provider.
Every time something went wrong in the traveling group and every time something hurt, it was time to complain and criticize. Just like Lot’s wife, they wanted to go back. They obviously did not have a testimony and feel gratitude that they had escaped destruction, or they would not have desired to return. We have to trust the prophet.
Those who don’t have a believing heart will probably have a critical heart, which can lead to anger, then to murderous feelings. Liars accuse others of lying. Because of the lies, they stir up people to anger, which comes from Satan (3 Nephi 11:29–30).