If the reason the characters seek revenge is vice, their plans will go astray and they will not be satisfied with justice. This idea is directly linked to Thorin, Smaug and Gollum, who sought revenge based on greed, pride and lust for power. These emotions are sinful because they concern the individual rather than the community. A central theme of Tolkien's works is that people belong to each other and must care for each other so that humanity can flourish. By focusing on their own benefit, Thorin and Smaug deconstruct the brotherhood central to virtue and life. Conversely, if revenge is carried out altruistically, there will be no complications and a feeling of satisfaction will be retained. In this category is Beorn, who killed the goblin and Warg for the sake of his ancestors who once lived in the mountains. Beorn's loved ones have been hunted by the goblins, but he will not give up the fight as he growls "The day will come when they perish and I will return!" (Tolkien 136). Beorn's bitter grudge against the goblin race comes from his respect for his bloodline rather than selfish desires, so he is exempt from the dark consequences of vengeance. By the frequency of self-centered versus selfless revenge, Tolkien suggests that revenge is primarily motivated by sin.