Not sure about the religion one but the rest is excellent.
I don’t think he was talking about the sacrifice that you’re thinking of . . I think he means, letting things go, ascetics . .
ascetic [uh-set-ik]
—noun
1. a person who dedicates his or her life to a pursuit of contemplative ideals and practices extreme self-denial or self-mortification for religious reasons.
2. a person who leads an austerely simple life, especially one who abstains from the normal pleasures of life or denies himself or herself material satisfaction.
3. (in the early Christian church) a monk; hermit.I believe that’s the type of sacrfice he meant. Cheers!