"When i do good, I feel good. 

When I do bad, I feel bad"

What this quote means from Abraham Lincoln is that when you do good you will feel good. So for example when you get 100% on a test you feel happy or you feel good. But then what if you got a 10% on a test you would feel sad or bad. So when you do good you receive good, but if you do bad you receive bad. This quote is very simple you do good you feel good. You do bad you feel bad. If you pay for a bag of chips instead of stealing them you feel good. But if you decide to steal them you will feel bad and not good.