If you do not forgive the sins and mistakes of others, it is because, regardless of what you say, you do not approach God with the posture of one who has been forgiven of wrongdoing.
Instead, you see yourself as more righteous than those who have wronged or inconvenienced you. And so, unlike Jesus Christ, who truly was holier than those who wronged Him, you refuse to extend them mercy. While Jesus spent Himself on His enemies’ forgiveness and rescue, you plant yourself on a throne of judgment and refuse to be gracious.
What do you really believe about grace? If you want to know how you really see yourself in relation to God, don’t look at your words.
Look at how you forgive.
And this could just as easily be a letter to myself.