Dangerous conceits are, in their natures, poisons.
Which at the first are scarce found to distaste,
But with a little act upon the blood.
Burn like the mines of Sulphur.
– William Shakespeare
Othello, Act 3, Scene 3. Having weaponized the corrosive power of jealousy to poison Othello’s mind with suspicious thoughts, a gleeful Iago delights in the pain he is causing. Using metaphor and simile, he speaks of Othello’s suspicions and excessive pride – "dangerous conceits" – as a poison that will burn inside him like sulphur. The Machiavellian manipulator uses demonic language here, "mines of Sulphur" being an allusion to hellfire. His hatred of his master is evident here.