Notes From The Underground by Part 2 Chapter 10 Page 5

I did mean a moment since to tell a lie--to write that I did this accidentally, not knowing what I was doing through foolishness, through losing my head. But I don't want to lie, and so I will say straight out that I opened her hand and put the money in it ... from spite. It came into my head to do this while I was running up and down the room and she was sitting behind the screen.

But this I can say for certain: though I did that cruel thing purposely, it was not an impulse from the heart, but came from my evil brain. This cruelty was so affected, so purposely made up, so completely a product of the brain, of books, that I could not even keep it up a minute--first I dashed away to avoid seeing her, and then in shame and despair rushed after Liza. I opened the door in the passage and began listening.