Grace comes free of charge to those who don't deserve it. It comes in the form of goodwill or a generous disposition. It can seem like indulgence or mercy when we're resentful or full of negative energy. If you have a spiritual side, and believe in God, then you believe that God's love comes free of charge with no strings attached, no matter what you do. Whether your friends and family react the same way is debatable. I think many people have been conditioned to accept their lot in life without realizing there is always light at the end of the tunnel, something positive within reach.
Consider forgiveness can be an unnatural act for people who struggle not to form grudges. It's human instict to desire to 'get even' when someone does you wrong. If a date stands you up, you may secretly hope someone returns the favor in the future. If your boss fails to respect you or treat you with respect, you may secretly hope the boss gets what he deserves. If an adversary takes advantage of you while you're down, you may hope Forces beyond you even the score.
Yet, people enter our lives to remind us success and peace of mind can't be founded on revenge. Personally, forgiveness isn't always easy for me. Letting someone get away with dishonesty, malicious or harmful deeds without reprimand isn't exactly satisfying. Injustice bugs me yet, then I remind myself that when I forgive, the negative energy loses its grip on me. Whether or not earthly or Higher authorities deal with a situation as I would like, its not for me to decide. When I let the burden of acting as judge disappear, I rethink scales of justice and mercy. That's another kind of grace. Perhaps guradian angels instill positive thoughts in our hearts and minds in order to influence our will and attitude toward good.