Iago's crimes define pathological jealousy and a sheer desire for revenge. His acts are pre-meditated and have reasons. In various soliloquies, he reveals grudges that, while mostly false or overblown, present themselves as clear to Iago. Iago masters duplicity, even remarking himself "I am not what I am." (line 67) Many of his dark motives are probably concealed from the audience. In his few soliloquies, he presents definitive motives for his vengeful desires. His passions are so dark that they can only be understood by himself. The first s ....