What two things about history does Lovecraft point out in the novel, The Case of Charles Dexter Ward?

Lovecraft makes two points about history in the tale of Charles Ward's succumbing to domination by the evil spirit of Joseph Curwen: First, that there is no such thing as a thoroughly unblemished period of history; along with the idealistic leaders of 1700s, Providence also had corruption and evil. Second, as someone researches his past, it becomes part of him. People are partly products of their histories. The mixture of good and evil in Charles Dexter Ward is a reminder that as human beings, all people are mixtures of good and bad, just as history is also such a mixture.