“Another thing that people must sacrifice is their suffering. It is very difficult also to sacrifice one’s suffering. A man will renounce any pleasures you like but he will not give up his suffering. Man is made in such a way that he is never so much attached to anything as he is to his suffering. And it is necessary to be free from suffering. No one who is not free from suffering, who has not sacrificed his suffering, can work.”
Ouspensky, In Search of the Miraculous.

This is about sacrificing unnecessary suffering (superfluous).