Notes From The Underground by Part 1 Chapter 2 Page 4

But at first, in the beginning, what agonies I endured in that struggle! I did not believe it was the same with other people, and all my life I hid this fact about myself as a secret. I was ashamed (even now, perhaps, I am ashamed): I got to the point of feeling a sort of secret abnormal, despicable enjoyment in returning home to my corner on some disgusting Petersburg night, acutely conscious that that day I had committed a loathsome action again, that what was done could never be undone, and secretly, inwardly gnawing, gnawing at myself for it, tearing and consuming myself till at last the bitterness turned into a sort of shameful accursed sweetness, and at last--into positive real enjoyment! Yes, into enjoyment, into enjoyment!

I insist upon that. I have spoken of this because I keep wanting to know for a fact