I have a character who makes a very long monologue in the first chapter of my novel. He is a stoic being giving a lecture to a group of people who have just inadvertently destroyed their world. He talks for multiple pages with only a few brief interruptions. He basically arrives, tells this group of people what they have done and what they must now do to fix the problem, and then disappears. I am concerned about how to properly write such a long monologue. Any suggestions?