Because forgiveness is like this: a room can be dank because you have closed the windows you've closed the curtains. But the sun is shining outside and the air is fresh outside. In order to get that fresh air you have to get up and open the window and draw the curtains apart.
If only I wasn't an atheist I could get away with anything. You'd just ask for forgiveness and then you'd be forgiven. It sounds much better than having to live with guilt.
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The first step in forgiveness is the willingness to forgive.