When I do good, I feel good. When I do bad, I feel bad. That's my religion.
Abraham Lincoln was well aware that goodness is the default setting in human beings while bad behavior is an anomaly and not a part of human nature. However, the science behind negative feelings arising from a bad conduct was not understood till Lincoln’s time.
Providing nuggets of wisdom on popular sayings
Evilness is not a human trait and in reality it is nonexistent. Intrinsically no human being can be evil or support injustice. When the culture because of improper understanding does handout wrong lessons as a way of life, human beings feel bad from the inside and over a period of time the new generations get rid of that practice. From the concentration camp of the Nazis to the mother Teresas and Dalai lamas, human beings are coming to value Compassion, Empathy, and community living.