What are the motifs in Legends of the Fall by Jim Harrison?

Passion is a recurring theme in the novel. In Revenge, Cochran disregards warnings and conventions to be with Miryea. Tibey responds with a passionate revenge, severely beating Cochran, and treating Miryea so harshly that she eventually dies. Tibey's revenge is fueled by his passionate despair over losing Miryea. After Cochran recovers, his quest to find Miryea energizes his life. His mission to find her is energized with a passion that causes him to ignore all danger. Cochran murders The Elephant, enraged over the part the man played in Cochran's fate.