" when I do good I feel good. when I do bad I feel bad."- Abraham Lincoln 

What I imagine this quote means is that when you help someone with anything, for example helping a old lady cross the street with a whole bunch of bags I would kindly help her with the and take them to were she lives . At the end of the day you'll feel like great about yourself. When you something bad you feel bad. For example, when you steal something from someone or somewhere you will maybe feel a gut feeling like if you were to have something stuck and can't get out.