Final answer:
Malvolio is comparing the darkness of the house to ignorance and expressing his sanity.
Step-by-step explanation:
The lines you provided are from the character Malvolio in William Shakespeare's play Twelfth Night. In these lines, Malvolio is making a comparison between the darkness of the house he is in and the darkness of ignorance. He suggests that ignorance is as dark as hell. He also claims that he is not mad, and challenges his associates to test him on any question to prove it.
Learn more about Darkness and ignorance in Twelfth Night