"Obedience is central to becoming, being and remaining happy" David Bednar

What this quote is saying is that being obedience will keep and make you happy. For example breaking the law is being disobedient and will get you arrested,which won't make you happy. Not following the rules in class is also being disobedient and you will most likely get a long while detention. Not listening to your parents will get you grounded, which will obviously not make you happy. But if you do what you're told in school or/and at home your parents or/and teachers will give you a reward or a good grade, which will make you happy.