During the course of the game, you will be prompted by the MLA (Milton Library Assistant) who discusses philosophy with you. Often he makes you choose one of several options and eventually twists your words to contradict yourself.
I've tried restoring from an earlier checkpoint to replay some of these conversations again and he usually ends up saying exactly the same thing in the middle of or at the end of the conversation.
Do any of your conversations with the MLA actually affect the game at all?