The Course states, “The state of sinlessness is merely this: The whole desire to attack is gone, and so there is no reason to perceive the Son of God as other than He is. The need for guilt is gone because it has no purpose, and is meaningless without the goal of sin.” (T-25.V.1:1-2)
What does this mean? When we perceive another as deserving attack, we are making real his errors. We believe that he does not “deserve” forgiveness because of the reprehensible nature of his crimes (against us). But the truth is that we are One with him, and if he does not deserve forgiveness, neither do we. Also: We feel guilty for retaliating, because our real Self knows that we have attacked one who, in reality, is the Son (or Daughter) of God. We therefore feel that we have done him an injustice, and we feel guilty about it. The truth is that we have done our brother an injustice, because in his depths he is pure; it is only in his illusions that he makes mad actions that hurt others, including ourselves. If we can see the truth of our brother’s real Self, we will not attack because we will perceive that he is lost in insanity.
We may feel threatened by the recognized mental illnesses in our midst, and we may get angry at the illness, but we normally do not blame the individual to any great extent, because we recognize that he is not in his real mind. The Course says that we are living a dream—and that the world we see because of our perceived dream is not real. Many of us are living a dream of attack that we do not recognize as unreal because we do not realize how much happier, under the tutelage of the Holy Spirit, we could really be.