This is a reason on why we cannot trust a person is for example the character Iago. In the beginning of the story he says “O, sir, content you I follow him to serve my turn upon him” (Act 1, Scene 1, Line 40). Iago is friends with Othello but he is going around his back and making him look bad. Othello is not aware of what Iago is doing because Iago suck’s up to Othello so Othello won’t suspect anything coming from Iago. In reality Iago is seeking revenge on Othello because Othello did not promote him to the rank of lieutenant.
Therefore no one is to be trusted because one day Iago was friends with Othello and the next day he is doing anything he can to have Othello tormented. Some of the things that Iago tries to do is instigate and persuade others to think the opposite from when they normally they do. Iago is also being two faced so that he won’t get caught. The main reason on why we cannot trust anyone is because they don’t trust you and people make mistakes and those mistakes stay in their head and they think what if. And one more example of why we cannot trust anyone is that Desdemona’s father Brabantio thinks that Othello as a wise man but he is not good enough to be with his daughter Desdemona.