Seeing is believingProof is something that all human beings seek. Without proving something for it to be valid, we would have nothing to say to each other when something is false. Ordinary people use evidence as part of reason; it was used to turn a hypothesis into a theory, a rumor into fact, without proof we would have nothing. There are many different ways to prove something, some more emotional than others; Asking a person to simply tell you that something is true or false isn't always enough, but in simplistic areas that may be all they have to work with. More complex questions involve a type of evidence that is the most concrete type of evidence; ocular evidence. Ocular evidence illustrates the saying “seeing is believing” by stating that something can only be proven if it is seen by the person who wants the proof. If a person receives eye evidence, it is not eye evidence to them but becomes word of mouth to confirm or refute what they thought. When looking for ocular evidence, it requires some sort of maneuvering depending on what you're looking to validate. In Othello's case, he wants visual proof that his wife is having an affair with Cassio; which means he should catch them in bed together. Othello is convinced by Iago that Desdemona must be having an affair since he saw Cassio with her handkerchief. In order to make what Iago says true, Othello demands ocular proof. Othello gives Iago another option, telling him that he must see Desdemona and Cassio in the act, or that it must be proven so that there are no other possible explanations for his wife's actions. This is a flaw that Iago received in order to better control how Othello sees things. Iago's devious and deceptive behavior and language lead Othell... middle of paper ...... another man; even less with Cassio who is Othello's lieutenant. Iago's anger towards Othello causes him to play with the Moor's emotions and manipulate what he sees using language as his weapon. Iago also uses Othello's trust in his ensign to further realize his revenge. He uses trusting language so that Othello has confidence in him. Iago also talks about things that don't interest him, but knows that Othello finds them important. When Othello “sees” that Iago has hurt Cassio, he feels the need to take revenge on Desdemona by killing her. At this point, Iago has convinced Othello that his wife is guilty of infidelity and that he no longer needs this ocular evidence that he has been searching for throughout the play. All because of Iago's observation of Desdemona's handkerchief, Othello begins to doubt his marriage and, in turn, trusts his "friend" more than his wife..