Iago is smart. He is an excellent judge of people and their characters. He knows Roderigo is in love with Desdemona and would do anything to have her as his own. Iago says about Roderigo, "Thus do I ever make my fool my purse." [Act I, Scene III, Line 359] By playing on Roderigo's hopes, Iago is able to swindle money and jewels from him, thus making himself a profit, while using Roderigo to forward his other goals. He observes of Othello "The Moor is of a free and open nature that thinks men honest that but seem to be so" [Act I, Scene III, Line 375]
How does Iago see others? He sees the world and other people as animalistic and ruled by their basest desires. Perhaps Iago knows this because he knows himself so well. Iago warns Brabanzio that "even now an old black ram is tupping your white ewe you'll have your daughter covered with a Barbary horse, you'll have your nephews neigh to you, you'll have coursers for cousins, and jennets for germans" [Act 1, Scene 1, Line 88 and 110] Iago describes Othello as a man ". . . will tenderly be led by the nose as asses are." [Act I, Scene III, Line 377] Iago tells Roderigo "I never found a man that know how to love himself . . . Virtue! A fig! Tis in ourselves that we are thus or thus. Our bodies are gardens, to which our wills are gardeners . . . If the balance of our lives had not one scale of reason to poise another of sensuality, the blood and baseness of