“When I do good I feel good, when I do bad I feel bad, and that's my religion.”
Quoted in 3:439 Herndon's Lincoln (1890), p. 439 http://books.google.com/books?id=rywOAAAAIAAJ&pg=PA439&dq=%22when+i+do+good+i+feel+good%22: Inasmuch as he was so often a candidate for public office Mr. Lincoln said as little about his religious code as possible, especially if he failed to coincide with the orthodox world. In illustration of his religious code I once heard him say that it was like that of an old man named Glenn, in Indiana, whom he heard speak at a church meeting, and who said: "When I do good I feel good, when I do bad I feel bad, and that's my religion."
Posthumous attributions
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Abraham Lincoln 618
16th President of the United States 1809–1865Related quotes

“I believe more in the goodness of bad people than i do in the badness of good people.”
Source: A Thousand & One Epigrams: Selected from the Writings of Elbert Hubbard (1911), p. 18.

As quoted and paraphrased in "Clemente 'Sick,' That's Bad News to NL Hurlers" https://www.newspapers.com/newspage/62573816/ by Lou Prato (AP), in The Warren Times Mirror (Tuesday, June 5, 1962), p. 12
Baseball-related, <big><big>1960s</big></big>, <big>1962</big>
Context: “I sick, I have nervous stomach. I can hardly eat. I’m taking lot of vitamins and I’m getting stronger. But I still sick.” [... ] Clemente said he’s been bothered by stomach trouble since last August. "During the winter I feel real bad. I lost 18 pounds but I’ve picked my weight back up a little since then. I don’t feel too strong and sometimes when I run I get short of breath. Sometime I feel good and sometime I don’t feel like playing ball at all.” [... ] “If I get a little stronger, I hit with more power and I help the club more.”

“When it’s bad, I get depressed; when it’s good, I get nervous.”
Humor in Psychotherapy (2007)

page 105.
Father and Child Reunion (2001)

Source: CBS Sunday Morning interview (2020)
Context: Answering the question "What did painting do for you after you came home from the Oscars?"

Source: The Happiness Project: Or Why I Spent a Year Trying to Sing in the Morning, Clean My Closets, Fight Right, Read Aristotle, and Generally Have More Fun