Several characters through the course of Steinbeck's novel East of Eden demonstrate a lack of self-knowledge or corruption of the soul. A gap is created between some the character's actions and their true essence as a person. The disparity between a character's conduct and their identity as a human being is often a demonstration of the fight between good and evil within the character's own soul. Caleb, one of Adam Trask's twin boys embodies this struggle vividly throughout his life. This search for self-identity plays into a key theme of the novel, which is that of free will. Despite the fact that there is a variance in the way a character wants to act or the person who they truly are at heart and the way that they actually carry out their lives, free will offers hope. Steinbeck pushes the idea that a person's life and fate is...