Christian theologians after the Middle Ages need to be credited for having started to sense the intolerability of their own resentment constructions. Subsequently, they felt compelled to weaken the excesses of their theology of rage. This was reflected in the invention of purgatory. It is probably not overdrawn to characterize the new theology of purgatory, which rapidly expanded from the eleventh century on, as the real Christian thought that created history.

- Peter Sloterdijk, Rage and Time