I have read Robinson Creuso by Daniel Defoe. I thought that book was a bit patchy. The part on the island was good but the beginning and ending were not.
I have just started Moll Flanders, supposedly the memoirs of a 'lady of the night' who made good. It has a cynical and hypocritical preface. The person who transcribed the memoirs said he had to tone down the language and cut the most graphic bits, but that the story served as useful instruction to readers, as a warning of what not to do. He said the earlier, more morally abhorrent parts of the story were a necessary contrast to the penitent's later state.