Cassian believes in the idea of repentance but also thinks that he doesn't deserve it. Other people do and he's always happy when he can get someone to a point where they get right with themselves and the galaxy, that's just not possible for him.

Lucy gave Tumnus the hope to believe that he could atone for what he almost did.

Quentin believes in debts and prices to be paid more than repentance, whatever you do, no matter how good the reason is, if someone is hurt, it will end up coming around to you someday. And saying sorry is only so helpful, you'll probably have to do something to make it right. That's how his world works.

I can't easily think of anything for my others at the moment.