Jesus is telling us in ACIM to do the same thing he did in his resurrection. That is, if someone comes along and kills your body, YOU RESURRECT IT.
This means, no matter what anyone does, no matter how hurt or sick, no matter the effect of sin, you MUST resurrect the body to prove that you CANNOT BE HURT. And you should be doing this ALL THE TIME, to guarantee the body's health and restore its condition regardless of what anyone tries to do, to PROVE that you do not believe in sin.
This in fact is the true meaning of "turning the other cheek". You will literally be willing to allow anyone to do anything to you including "hitting you again", in the recognition that you will NOT be hurt by it, will HEAL the body, and will PROVE to him that you have power OVER the body. Your demonstration that you ARE NOT HURT PHYSICALLY, teaches him his innocence.
THIS is what real forgiveness means. Forgiveness is not real if it does not heal the body. It is not real if the body is still testifying to your brother's sins. It is not real if you have not forgiven AND UNDONE THROUGH ATONEMENT the effects of sin in the body.
Jesus literally meant that if someone hurts you, you should turn your cheek and invite him to DO IT AGAIN. Because you will be able to prove THROUGH MIRACLES that it has no effect on you or your body. This only makes sense given that you CAN perform miracles to undo physical damage. And because HE COULD, this is why he is teaching us to do the same.
Jesus had the power to NOT BE AFFECTED. Such profound confidence and fearlessness. That he would "allow" crucifixion because HE KNEW that what he really was could not be hurt, and that HE COULD DEMONSTRATE this by resurrecting and healing the body.
"You cannot be hurt, and do not want to show your brother anything except your wholeness. ***Show him that he cannot hurt you*** and hold nothing against him, or you hold it against yourself. This is the meaning of "turning the other cheek."
"Now in the hands made gentle by His touch, the Holy Spirit lays a picture of a DIFFERENT you. It is a picture of a body still, for what you REALLY are can not be seen nor pictured. But THIS one has NOT been used for purpose of attack, and therefore never suffered pain at all. ****IT witnesses to the eternal truth that you can not BE hurt****, and points BEYOND itself to both YOUR innocence and HIS.
Show THIS unto your brother, who will see that every scar is healed, and every tear is wiped away in laughter and in love. And he will look on his forgiveness there, and with healed eyes will look BEYOND it, to the innocence that he beholds in you. Here is the proof that he has NEVER sinned; that NOTHING that his madness bid him do was ever done, or ever had effects of any kind. That NO reproach he laid upon his heart was EVER justified, and NO attack can touch him with the poisoned sting of fear. Attest his innocence and NOT his guilt. YOUR healing is his comfort and HIS health. BECAUSE it proves illusions were not true."
THIS also directly ties into the secret of salvation. Jesus tells us that we'd be willing to allow people to be AS VICIOUS AS THEY MAY, that it can HAVE NO EFFECT ON YOU. This will set you free from suffering in ANY FORM. Thus will enable you to UNDO ALL FORMS OF ATTACK and demonstrate that you can repair the body just as easily as it can be hurt by someone.
"The secret of salvation is but this: That YOU are doing this UNTO YOURSELF. No matter what the form of the attack, this STILL is true. Whoever takes the role of enemy and of attacker, STILL is this the truth. Whatever seems to be the cause of any pain and suffering you feel, this is STILL true. For you would not react at all to figures in a dream you knew that YOU were dreaming. Let them be as hateful and as vicious as they may, they COULD have no effect on you, unless you failed to recognize it is YOUR dream. This single lesson learned will set you free from suffering, WHATEVER form it takes."
Thank about Jesus, totally aware that he cannot be hurt by anything, totally aware he is not a body, able to resurrect bodies, able to heal the sick and raise the dead, able to cancel all effect of sin and attack on him. Even DEATH was not able to be sustained and he re-manifested a complete human body just to prove that he had power OVER all suffering. No-one could do anything to him. They could seem to attack his body but he could simply override it. He had supreme confidence and fearlessness. Imagine how safe you would feel if you were in touch with this power of God, this supernatural protection, ABLE to work miracles to undo anything that happens. You would laugh in the face of any threat or danger.
What Jesus DID in "the resurrection" he was ALREADY practically doing prior to the crucifixion. He had already got himself to the point of being able to reverse death and sickness. He could barely be harmed. He could've undone any illness. And when the crucifixion happened which was him ALLOWING an "outrageous extreme assault" to occur, he knew that he would resurrect from it and prove that it had no power over him. He must've been laughing inside at the preposterous idea that he would have to suffer forever more or be caused to "stay dead" at the hands of some foolish attackers.
And so similarly we are asked to demonstrate resurrection principles HERE AND NOW, in the world, as teachers of God, proving that we are under no laws but God's!