In the church, and especially in the mission field, there's a lot prosperity gospel being preached if not outright, then subtly. Prosperity gospel is basically the idea that if you're super righteous and work really hard, God will dispense blessings from the Eternal Vending Machine in the sky. You will baptize people, you will become District Leader, you will train a new missionary, you will become Zone Leader, you will transcend all other missionaries to become the coveted Assistant to the President. All that is to say, that if you have a divine calling from God to serve as a leader in the mission, you achieved that title because of your obedience to the mission rules, the commandments, and God is pleased with your service. The unspoken understanding of the opposite is also true: if you're not advancing it's because you're lazy, disobedient, and out of favor with God.