Of Mice and Men: Four Major Themes "Of Mice and Men", by John Steinbeck, is composed of four major themes. These themes are the value of dreams and goals, moral responsibility, social injustice, and the bond of friendship and loyalty. The value of dreams and goals are that they provide hope and the desire to keep going in life, rather than laying down to die. When Lennie is feeling depressed in the woods he asks George to tell him about the "dream farm" again. This is the farm that Geore and Lennie hope to own someday. Even though this dream seems almost impossible at the time it still generates enough hope to keep Lennie and George going. When George starts tal