The aim of “Roxana, or the Fortunate Mistress,” like that of “Moll Flanders,” is to describe the gradual corruption of a woman, who is influenced by some conscientious scruples and misgivings, but the heroine is placed in a higher station of life. We have a curious commentary on the times in comparing the body of the work with the preface. “Roxana” is among the coarsest records of vice in English fiction. But yet it is to impart moral instruction. “In the manner she has told the story it is evident she does not insist upon her justification in any part of it; much less does she recommend her conduct, or, indeed, any part of it, except her repentance, to our imitation. On the contrary, she makes frequent excursions, in a just censuring and condemning her own practice. How often does she reproach herself in the most passionate manner, and guide us to make just reflections in the like cases?” The modern reader is astonished to find “that all imaginable care has been taken to keep clear of indecencies and immodest expressions; and, it is hoped, you will find nothing to prompt a vicious mind, but everywhere much to discourage and expose it.”
Defoe is much more successful in teaching a moral lesson in “Colonel Jack.” The aim of this novel is to describe the course of a street-boy who takes to thieving before he knows that it is not a legitimate business, and who being possessed naturally of a good character is brought to repentance and reform when subjected to better influences. Defoe’s preface has great significance when we consider the deplorable condition of the lower classes and no better idea can be gained of the usual fate of the children of the poor than is afforded by this novel.