Jesus gives some difficult instruction on divorce, teaching that God has intended for marriage to be permanent. He has a conversation with a rich man who wants to earn his way into heaven. Jesus sees this kind of self-sufficiency as something that keeps people from trusting Jesus.
Taking responsibility is a good thing, but self-sufficiency takes it too far. We need to rely on Jesus to take away our sin. No amount of doing good will ever make up for the bad things we have done.