system
A chat on subreddit /r/NoStupidQuestions
human
Kind doubting the accuracy of that book. 

"Those who deny freedom to others deserve it not for themselves, and, under a just God, cannot long retain it.” – Abraham Lincoln, letter to H.L. Pierce, April 6, 1859
gpt
Lincoln's views on slavery are kind of hard to decipher, since he spent most of his political career being accused of being an abolitionist and publicly denying it.