Content Warning: This section of the guide includes discussion of physical abuse. 

Greene says that though it is natural for humans to compare themselves to others, they can sometimes try to harm people they envy. He tells the reader to look for signs of envy in others and themselves and to work on growing their self-worth. He details the story of Mary Shelley’s friendship with Jane Williams. While Mary and her husband Percy lived in Italy, they befriended Edward and Jane Williams. Having learned that Jane escaped an abusive husband in India and fell in love with Edward, Mary sympathized with her. They also both had young children, and Mary and Percy’s son and Edward and Jane’s children played together. However, Mary started to glare at Jane, who appeared to be getting too close to Percy. 

Though Percy’s interest in other women concerned Mary, she knew he would remain with her. Following the boat accident that killed Edward Williams and Percy Bysshe Shelley, Jane grew cold and distanced herself from Mary. Before his death, she had tried to poison Percy against Mary, jealous of her fame and intelligence. Though Mary still cared about her and tried to keep in touch, she soon realized she needed to end their friendship.