Though in the trade of war I have slain men,
Yet do I hold it very stuff o’ the conscience
To do no contrived murder: I lack iniquity
Sometimes to do me service.
– William Shakespeare
Othello, Act 1, Scene 2. Iago’s comment about how he lacks a disposition for wickedness and hurting others is ironic. He not only has no problem hurting people, but delights in their pain while doing it.