@Creed Of Kings,
I used this great example in one of my papers:
One day, while riding in a coach, Lincoln and a few passengers were debating …Is helping ever altruistic? Lincoln argued that helping always stems from self-interest, whereas the other passenger took the view that true altruism exists. Suddenly … [Lincoln ordered the coach to stop and he saved some drowning piglets.] When he returned, his companion said, ‘Now Abe, where does selfishness come in on this little episode?’ ‘Why, bless your soul, Ed,’ Lincoln relied. ‘That was the very essence of selfishness. I should have had no peace of mind all day had I gone on and left that suffering old sow worrying over those pigs. I did it to get peace of mind, don’t you see? (Aronson, 2005, p. 362).
It is from my Social Psychology textbook citation:
Aronson, E., Wilson, T. D., & Akert, R. M. (2005). Social Psychology. Saddle River NJ: Prentice Hall.
I am not sure if it is a true story or not but I think that Lincoln did hold this belief.