What are the motifs in Brokeback Mountain by Annie Proulx?

Suffering is a motif in the story. After Jack dies, the landscape is filled with bleakness, containing no moments of beauty that can relieve Ennis's heartache. Then “the huge sadness of the northern plains rolled down on him” as he passes “desolate country” with “houses sitting blank-eyed in the weeds.” Although he tries to convince Jack's father to let him take Jack's ashes up to Brokeback Mountain, the old man refuses, committing them instead to “the grieving plain” that echoes Ennis's suffering.