I was sorry to hear Jim say that, it was such a lowering of him. My conscience got to stirring me up hotter than ever, until at last I says to it, “Let up on me – it ain’t too late yet – I’ll paddle ashore at the first light and tell.” I felt easy and happy and light as a feather right off. All my troubles was gone.

– Mark Twain

The Adventures of Huckleberry Finn, Chapter 16. Huck’s conscience troubles him after Jim threatens to buy or steal his children from their slave owner. He tells his conscience he will turn the runaway slave Jim in.