"you cannot do wrong and feel right. It is impossible."- Ezra T. Benson 

i think what this quote means is that when you do something bad you ever feel good about yourself. meaning that no one ever leaves anything bad without feeling guilty. for example, if you steal an old lady's bag would you feel good like you never know that can be your grandma. also if they would have done something like that to one of your family how would feel mad or what.