When you forgive, that means you absorb the loss and the debt. You bear it yourself. All forgiveness, then, is costly.
If you didn't earn your salvation how are you going to un-earn it?
If you add anything to Jesus as a requirement for being happy, that's your real king.
In the end, we love people into belief. We do not argue them into belief.
The essence of forgiveness is absorbing pain instead of giving it.
The more you understand how your salvation isn't about your behavior, the more radically your behavior will change.