The constant exercise of our faith by lofty thinking, prayer, devotion, and acts of righteousness is just as essential to spiritual health as physical exercise is to the health of the body. Like all priceless things, faith, if lost, is hard to regain. Eternal vigilance is the price of our faith. In order to retain our faith we must keep ourselves in tune with our Heavenly Father by living in accordance with the principles and ordinances of the gospel.