Hyperbole

Deliberate exaggeration, which no one takes literally, to give emphasis to a feeling or a situation.

In Notes from Underground

You believe in a crystal edifice, eternally unshakable, that is, one in which one could not even stick one's tongue out on the sly, nor make a fig in one's pocket.

Promising an «eternally unshakable» edifice, with no room even for a tongue shown, pushes the utopian project to exaggeration. The excess shows why the narrator rejects it: too perfect for a free gesture to fit inside.

Part One: The Underground, the underground man

your name will vanish from the face of the earth, as if you had never existed or been born!

Part Two: Apropos of Wet Snow, the underground man

Then know that I am ashamed, and how ashamed I am, that above all else I dread it, even more than if I had stolen, because I am vain as though my skin had been stripped off, and even the air hurts me.

Part Two: Apropos of Wet Snow, the underground man