O monstrous, monstrous!
Nay, this was but his dream.
But this denoted a foregone conclusion.
‘Tis a shrewd doubt, though it be but a dream,
And this may help to thicken other proofs,
That do demonstrate thinly.
These lines are from Act III Scene 3 from Shakespeare’s play Othello. In this part Othello is already under Iago’s spell and believes that Desdemona has betrayed him. He also believes that Cassio’s alleged dreams are due to adultery they committed with Desdemona.