Themes
When I do good I feel good, when I do bad I feel bad, and that’s my religion.
— Abraham Lincoln

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker describes a personal creed based on conscience: doing good brings a good feeling, doing wrong brings a bad one, and that simple emotional response is the whole of their religion. Morality is presented as lived feeling rather than doctrine.
Context reviewed