Forgiveness

How are we supposed to forgive people who have no consciousness of even doing anything wrong? They say that a man is as good as his word, so if someone goes back on that word, what good is that person? When someone says something will happen, you count on it, you make your plans around it, you do what you can to make sure it can happen. And then, to go back on that commitment, to stop it before it can start, that's wrong. But if the person isn't sorry for it, even did it intentionally, that makes it even harder to forgive. It makes me downright angry. And yet I know that have to forgive. If I don't the anger will take root in my soul, and lead to bitterness and resentment that lash out at other people who have done me no wrong. I've been hurt before, but never like this. How can I forgive? It is so hard.  I know that I have to let it go, but I can't, not yet at least.
And then I think:
70x7: that's how many times Jesus told us to forgive the same person for the same fault.  And this person has only wronged me once.
Forgive us our debts, as we forgive our debtors: If we don't forgive others, God will not forgive us. How much worse is that than holding onto anger?
Father, forgive them, for they know not what they do: If Jesus could forgive those who killed Him, surely I can forgive.
Lord, do not hold this sin against them: Stephen forgave those who stoned him.  These stones that hit me are incomparable.

Not forgiving is a prison.  With God's help, I'll break the chains, forgive the wrong, and walk free.