I didn't assume Christianity or Judaism on your part. Though, it's less likely for a Jew to mistake sacrifice (for atonement) to forgoing things to be able to do other things.
But "sacrificing things" to work harder is still not the context of either.
I don't really understand the reason for your reply.
Hosea 6 clearly refers to burnt sacrificial offerings like killing animals. consider the full context:
"I desire steadfast love and not sacrifice, the knowledge of God rather than burnt offerings."
Matthew 9:13 just quotes the verse in Hosea and talks more about loving others and being merciful to those who are sinning:
“It is not the healthy who need a doctor, but the sick. But go and learn what this means: ‘I desire mercy, not sacrifice.’ For I have not come to call the righteous, but sinners.”
Apologizing for sinning (ie. repentence) remains an essential part of Christian doctrine and the bible