Forgiving Difficult People!

There are people who are naturally difficult and no matter how many times you apologise and ask for forgiveness, they will not forgive you? We also have people who no matter how much you try to show them their mistake, they will not apologise nor seek for forgiveness. How do you deal with such? The scriptures advises us that so far as it depends on us, we leave peacefully with all people. Am much as we have done what is practically possible, we cannot be held back by the complication of others. Forgiveness is a delegated responsibility and so far as we make peace with God and attempt to reach out to others, we should be free.