"Obedience is the great test of life"-Thomas S. Monson 

Obedience is the great test of life because if you are obedient then you will always be successful. If you choose to obey your elders and superiors then you will be successful. If you don't then you will have some negative consequences. An example is a boy listening to his mom. If he doesn't listen he will have a negative outcome. If he does obey he will have a positive outcome.