Repeatedly Jesus instructs us in ACIM to demonstrate that you are invulnerable.
He says that we are to show our brother that nothing he has done has had ANY effect on us.
He says that we are to demonstrate that we are innocent and our brother is innocent.
He says we are to show our invulnerability by having no effects of attack.
He says we need to be completely unaffected by the world and "I am not a victim of the world I see". Not a victim AT ALL.
He wants us to basically stand there, while the world and its people are doing absolutely whatever they want to do, and be absolutely unaffected, unchanged, undisturbed. Our peace is meant to be so rock solid that we are not moved by anything.
This really means we're being called to NOT play the game of "I am suffering" or "I've been victimized" or "I'm unfairly treated" or "You did something to me" or "I am this way because of someone else" or "I didn't ask for this" or "I've been changed by the world" or "There are effects in me that I didn't put there".
Jesus repeats this theme when he says that nothing happens to us without our consent, we always get what we ask for and we never get what we do not ask for. He goes on to tell us to make sure never to give any belief or reality to the suggestion that the Son of God has been or can be affected by anything, including having absolutely no belief in sickness or separation.
He asks us to see no blame whatsoever in our brother or ourselves. To see ourselves as completely blameless and guiltless.
Innocence doesn't just mean 'you didn't do anything', its an experiential state of INVULNERABILITY and IMMORTALITY, in which quite literally you recognize nothing can or has happened to you.
But who is the 'you' that nothing happens to? It's not the you that you think you are. It's your real self.