Iago considers how easy it would be to manipulate Desdemona into subduing Othello in order to win him back. Iago plans to poison Othello's mind against Desdemona by convincing him that she is only helping Cassio due to her lust, and in doing so will undermine her reputation with Othello. Iago's goal is to use Desdemona's own goodness against her to entrap them all in his web.