I stared at him and then at Tom, who had made a parallel discovery less than an hour before – and it occurred to me that there was no difference between men, in intelligence or race, so profound as the difference between the sick and the well.

F. Scott Fitzgerald

The Great Gatsby. Chapter 7, Nick makes the connection between Tom and George, in that their wives are cheating. But the dividing line between the men is that Tom blames Gatsby for driving his wife away, while Wilson blames himself for allowing Myrtle to have an affair with another man to the point where he is physically sick.