The crux of the Lesson is this:

“We will forgive them all (our thoughts of illusions), absolving all the world from what we thought it did to us.”

Again the Course points out that there is no sin.

What wasn’t loving never occurred. It was a dream.

And, as with Ho’oponopono, I can ask for forgiveness of my unloving thoughts in any instant that I say:

I love you. I’m sorry. Forgive me. Thank you.

I accept the peace that this will bring today and wish you the peace that passes all understanding. This is the world I choose to see and create today.

“The peace of God is shining in me now. I love you, I’m sorry, Forgive me, Thank you.”