We're presented with an interesting challenge. Before you seems to be a brother who seems to have a body, seems to have a personality, seems to have a history, seems to believe various things and perceive in various ways.
But then, at the same time, your REAL BROTHER, is actually a spirit being, a soul, who is an absolutely perfect light of Heaven, completely invulnerable and immortal, absolutely awake, totally free from sickness and suffering, perfectly sane, happy, free, and full of love.
So now the question is, when you "relate" or interact with a person, are you going to consider that their bodily limited self is REALLY the person, or are you going to consider that their HOLY self is really the person? And if you acknowledge and relate only with the holy self, does this not show you that the bodily self is NOT WHO HE IS? Does it not frame all of his illusions AS illusions and as lies and falseties about him, that you are not supposed to believe, or see, or confirm, or hold against him?
It becomes now a matter of, are you willing to overlook everything about him that seems to be "here", as a body self, a worldly self, an ego self, and completely IGNORE all of it, and connect and relate ONLY to a REAL SELF, that is hidden by the body, obscured by false perceptions, and lurking in and BEYOND the body as your ACTUAL BROTHER?
Are you willing to realize that all of these body persons are actually not real, all of these forms and differences are illusions, no-one is really a body, no-one is different or unique, everyone is equally a brother and equally lovable? And are you willing therefore to LET GO OF, the belief you've had for thousands of years, that these "people" populating the dream that you thought were "real", they are just shadows of real beings who are temporarily invisible to your body's eyes, and who are absolutely perfect?
At some point we have to become willing to disregard these illusions that are being presented to us, these obstacles to peace, and learn to overlook them. This is literally forgiveness, which changes your perception, awakens your mind and shows you with CHRIST VISION the true nature of the brother that stands before you. And that means learning to question, let go of, ignore, not believe in, not take seriously, and basically disregard, anything and everything about a person that seems "traditionally human", and to instead look PAST THAT, to what can ONLY be the truth about them. That they are still perfectly the Christ as God created them, flawless and immaculate, perfect in every way, unconditional and universal, and free from all suffering, sin, guilt, fear and death.
It's a strange thing to do. Because we've been so used to looking with the body's eyes and seeing "people" and thinking this is all there is to them, looking at bodies and taking them as first-hand reality, looking at behaviors and appearances and differences and thinking this is TRUE of the person, and generally interacting with DREAM CHARACTERS. And these dream characters are NOT REALLY the depiction or representation of your actual brothers. Not unless, perhaps in currently rare cases, your brother is using his body to accurately symbolize his immortality. And even then, he is not his body.
Are you willing to overlook EVERYTHING your body's eyes show you? Are you willing to start interacting with the "higher self" or holy true self of your brothers? Are you willing to stop dwelling on bodies and what bodies do, and start peering deeper into people into their minds and souls? Are you willing to disbelieve anything about your brother that is not given by God, is not in accord with God's laws, and does not represent God's perfection? To recognize that all the rest is NOT TRUE of them or you? And to realize that all of your brothers are your perfect equals AS GOD CREATED US?
This is what it means to forgive your brother. To totally overlook ("to forgive is to overlook") the illusions that hide your brother from you, and learn to SEE the TRUTH of Him, which is absolutely as perfect and permanent as He has always been and forever will be.
"Look at your holy brother, sinless as yourself, and let him lead you there."
"Look, then, BEYOND error, and do not let your perception rest UPON it, for you will believe what your perception HOLDS."
"Forgive him your illusions, and behold how dear a brother he would be to you."
"Your brother has a changelessness in him beyond appearance and deception both."
"And while you see your brother as a body, APART from you and separate in his cell, you are demanding sacrifice of him AND you. "
"And to ACCEPT the limits of a body is to IMPOSE these limits on each brother that you see."
"It must reach out beyond itself, as you reached out beyond the body to LET yourselves be joined."
"Far beyond his dreams is his reality."
"When you attack a brother, you proclaim that he is limited by what you have perceived in him. You do not look beyond his errors. Rather, they are magnified, becoming blocks to your awareness of the Self that lies beyond your own mistakes, and past his seeming sins as well as yours."