Between the Shaman of the Tungus, the European prelate who rules church and state, the Voguls, and the Puritans, on the one hand, and the man who listens to his own command of duty, on the other, the difference is not that the former make themselves slaves, while the latter is free, but that the former have their lord outside themselves, while the latter carries his lord in himself, yet at the same time is his own slave.

Der Geist des Christentums und sein Schicksal [The Spirit of Christianity and its Fate] (1799)