Albert Camus, The Plague

Rieux: I know now that man is capable of great deeds. But if he isn’t capable of a great emotion, well, he leaves me cold.
Tarrou: One has the idea that he is capable of everything.
Rieux: I can’t agree; he’s incapable of suffering for a long time, or being happy for a long time. Which means that he’s incapable of anything really worth while.