"When I do good, I feel good.
              When I do bad, I feel bad."
                   -Abraham Lincoln
Its like saying when you do a good action, you feel good about your yourself both physically and emotionally. And when you do something bad you will obviously feel guilty and ashamed of yourself. An example would be, a man drops his wallet, he has so many things in his mind to notice that it fell. A good action would be, you pick it up and run after him to give it back and feel good about yourself. A bad action would be for you to pick it up and walk away with out giving it back, and not knowing how important it was to the man and felling so guilty and ashamed of yourself.