What does it mean to see mistakes instead of sins?

In ACIM, mistakenness is not the same thing as how the world generally thinks of it. If you go into the women's toilet instead of the men's, it could be a mistake. A mistaken action. If you pick up the wrong set of keys, it could be a mistake. If you leave your lunch box at the workplace, it could be a mistake. Something you intended that sort of went wrong somehow.

You could then try to turn these mistakes into sins and say that the person is guilty for going into the wrong bathroom, or a bad person for forgetting the proper keys, or stupid for leaving their lunch at work. But a "forgiving" reframing of this that says like "oh well they just made a mistake because they were supposed to go into the other toilet", isn't forgiveness. It just recognizes a horizontal worldly error within this system.

Forgiveness is higher than this. True mistakenness is a recognition on a vertical axis. It's a view from above, from a mindset of sanity and truth and light. It looks down and sees something impossible, something which cannot be true, and recognizes it as not true or real. Something false. Like a lie. And because it recognizes it as untrue, it is not attracted to it, and it doesn't turn it into something to be punished for. Instead it recognizes that the error just needs to be corrected. It was just a mistaken view, a mistaken belief, which can't be true, and the mind needs to be restored to the truth.

So if in the world, say, we take something that someone is believing or doing, based on a mistake. Let's say that they're having a sickness and coughing all over everyone. You could take this mistake and turn it into a sin. Sin does the opposite of see correctable errors, and sin doesn't recognize a mistake AS a mistake. Instead it thinks of it as a TRUTH, as something real and valid, and actual. The person really is coughing all over the other real people, how horrible. What a sinner.

To move to forgiveness then, we need to shift away from "it's a sin" to "it's a mistake". But not in worldly terms. Not in social preferences or rules about how to act around people or other made up stuff. True mistakenness would recognize that a) the person is not a body even if they think they are b) they are not really sick because they are immortal c) no-one is really suffering d) contagion is a lie e) nothing real can be threatened etc... that sort of thing. In effect that ... this whole show, this body person, this coughing, this spewing, is all FALSE. It isn't true, it isn't happening, it isn't POSSIBLE in God.

If we can see that this event isn't possible, is false, isn't true of the person, they are not really doing it, its having no effect, etc, then we can recognize that the person is in a sate of insanity and is just simply mistaken about how and what they are. They're showing a lie. They're trying to convince you sin is taking place. It isn't. We recognize there are just a bit insane, a bit mistaken, calling for love, in need of healing and correction. None of what they are doing is possible, none of it is true, none of it is happening but in a dream.

That's the kind of mistakenness that the Holy Spirt recognizes. He sees errors and does not mistaken them for sins. The ego on the other hand tries to take mistakenness and hold it against people, narrows down to focus on it, judges it, makes it out to be TRUE, believe it is HAPPENING, believes it is POSSIBLE, and is HAVING EFFECTS ... and that's all basically a definition of "sin". The idea of an attack which can have real consequences against real things.

"Into eternity, where all is one, there crept a tiny, mad idea, at which the Son of God remembered not to laugh. In his forgetting did the thought become a serious idea, and possible of both accomplishment and real effects." UrT27I6

It's kind of all about recognition. If you recognize what is possible and true in God, then you recognize when someone is MISTAKEN. Their mistakenness calls for correction not punishment. You recognize what they are presenting is NOT POSSIBLE, and can't be true, so is not actual or real. So you can't hold it against them.

If you FAIL to recognize that the person is just mistaken or "being false", you make another mistake, by mistaking a mistake for NOT a mistake..... you turn the mistake or falseness into a TRUTH, and now because it is true it seems REAL to you. Or like a fact. The person really is coughing all over everyone. The person really did go into the wrong bathroom. The person really did leave their lunch at work for the 5th time.

"The Holy Spirit CANNOT punish sin. Mistakes He recognizes, and would correct them all, as God entrusted Him to do. But SIN He knows not, nor can He RECOGNIZE mistakes that cannot be corrected. For a mistake that cannot be corrected is MEANINGLESS to Him. Mistakes are FOR correction. They call for NOTHING ELSE." UrT19D4

Largely such mistakes are easy to mistake for sins, rooted in physical stuff. All the things we do with the body, all the things in the world, are all IMPOSSIBLE. ... and they present temptations, and illusions that you can do things which CANNOT BE TRUE in God, such as being sick. If you take those illusions AS TRUTH, you believe they are real, and now the physical act is interpreted as a sin. You lock it in place as though it can't be reversed or forgiven. And now in unforgiveness you "accuse" the person of "really doing this", and justifying punishment. Who moved my cheese?!

So basically we have a mind full of illusions and insanity which is just a state of making a lot of mistakes and believing untrue stuff. That only calls for correction. But if you take that stuff and do not recognize it and do not realize it is untrue, you will MISTAKE IT for truth and now it becomes SIN. As though you're really doing it. That's the little shift the ego insanity makes. That little shift from "it's just an illusion" to "taking that illusion seriously because you're actually really doing it." Ego grabs ahold of mistakes and corrupts them into punishable acts of evil. As if you intended it on purpose.

We are just mistaken. And we are mistaken about being mistaken. And when we lift away the mistakenness about being mistaken, we'll recognize we are mistaken, and then stop being mistaken. And that is forgiving.