"You cannot do wrong and feel right. It is impossible" 

              -Ezra T. Benson

This quote means that no matter what bad thing you do you will feel bad for doing the bad action did and as well when you do good you will feel good and wont feel bad or terrible at all. So it is always a good thing to do the good and never the bad. An example is if you lie to your parents about something later on you will feel bad.