George Orwell. One thousand nine hundred eighty four (№ 9582)

Winston, how does one man assert his power over others?
After all, he thought.
- Forcing them to suffer, he said.
- Absolutely. Forcing him to suffer. Obedience is not enough. If the person is not suffering, how can you be sure that he obeying your will and not his own? The power is to hurt and humiliate. To tearing human minds to pieces and putting them together again in this form in which you want.