Well, I can tell you it made me all over trembly and feverish, too, to hear him, because I begun to get it through my head that he WAS most free – and who was to blame for it? Why, ME. I couldn’t get that out of my conscience, no how nor no way. It got to troubling me so I couldn’t rest; I couldn’t stay still in one place. It hadn’t ever come home to me before, what this thing was that I was doing. But now it did; and it stayed with me, and scorched me more and more. I tried to make out to myself that I warn’t to blame, because I didn’t run Jim off from his rightful owner; but it warn’t no use, conscience up and says, every time, “But you knowed he was running for his freedom, and you could a paddled ashore and told somebody.” That was so – I couldn’t get around that noway. That was where it pinched.
– Mark Twain
The Adventures of Huckleberry Finn, Chapter 16. Huck is having a moral crisis. Conflicted over matters of right and wrong, and questions of freedom and slavery, he wrestles over what he should do. Jim is all excited about the possibilities of freedom, but Huck knows that according to the racist society he comes from, he is breaking the law for aiding and abetting a runaway slave.