After some time, to abuse Othello’s ear
That he is too familiar with his wife.
He hath a person and a smooth dispose
To be suspected, framed to make women false.
– William Shakespeare
Othello, Act 1, Scene 3. Iago reveals his plan to manipulate and drop hints to Othello that Desdemona is cheating on him with Cassio. People will be inclined to believe this of Cassio because of his good looks, charm and charisma, he believes. Iago shows himself to quite the evil genius here.