"What you find difficult to accept is the fact that, LIKE your Father, YOU are an idea. And like Him, YOU can give yourself COMPLETELY, wholly without loss, and ONLY WITH GAIN."
When giving and receiving are seen as separate, you will believe that your brother gives something to you without giving it to themselves. That they escape from the effects of what they cause.
You will also believe that you are receiving something that you did not give. This is perceived as an attack against your will. If you did not give it, you have not asked for it, and yet have received it, so you do not want it.
If we are in any kind of perception where it seems like we are receiving something - being at the effect of - others or anything in the world or body, it's because we believe there is a separation between giving and receiving.
You cannot receive without giving, in truth. But ego is the idea of separation between cause and effect, or father and creation. If cause escapes from its effects it does not receive what it gives, and so "gets away with murder" by being able to do something without experiencing the consequences.
The ego then really is nothing more than a logical premise that you are separate, and every other conclusion that you come to is based on that. If you are separate, what you give and receive are separate. And who you give and receive them to/from are separate.
If you are separate, it makes perfect logical sense that you should not give, otherwise you will fail to receive what you have given, and therefore will lose it. No-one would consider it to make sense to give when they see themselves as standing to lose in the deal.
The ego or "a sense of self based on the assumption that you are separate", only appears to be selfish, or having unshared self-interests, because it makes perfect sense to do so. If separation is true, you should and cannot share with anyone, and therefore must hoard everything, or you'll end up with nothing.
People being egotistical will therefore automatically and quite "naturally" attempt to keep everything for themselves, and will be unloving, only because it makes sense to them. They recognize that giving is a loss and a sacrifice, so it works against them to give anything away freely.
This simply means that such a person is mistaken, because what they believe about themselves - that they are separate - is false. It isn't a sin, therefore, to be selfish, it is just a mistake based on a false premise. ie it's completely understandable why we'd want to claim private possession of everything if it's true that we are fundamentally a non-shared identity.
All we then need to do, which sounds simple enough, is transition from a sense of being separate, to a sense of being joined. This is nothing more than a shift in premise from "I am separated off" to "I am one with". From what appears to be a state of selfishness, to a state of sharing. From inequality to equality.
If the premise is that we are shared, our identity is shared (Christ), and we are each other (one), then it will make perfect logical sense to say that we CAN give everything away and still end up with everything. To have all, we can give all to all. And to have all, we should give all to all. This then means that if you DON'T give everything, you will have nothing.
So now it becomes in your own best interests to give love unconditionally all the time to everyone, because you recognize that this IS the ONLY WAY that you can receive it. To be included in the receipt of the love, you must be one with the receivers. And giving must not be seen as loss or sacrifice or deprivation, or any kind of a cost. What is seen as a cost is seen as a punishment.
If we are one, then what is mine literally is yours, and what is yours literally is mine. And because we share everything, the same everything belongs to both of us. And now no-one can lose anything at all.
Forgiveness reflects this truth that everything belongs to everyone, and therefore everyone loves everyone in order to receive everything. This reflects the nature of heaven, in which everything literally belongs to everyone simultaneously, and everything is shared - even your self.
"You had everything when you were created, just as everyone did."
"To give and to receive are one in truth."
"Here are both giving and receiving seen as different aspects of one Thought Whose truth does not depend on which is seen as first, nor which appears to be in second place."
"The unforgiving mind does not believe that giving and receiving are the same. Yet we will try to learn today that they are one through practicing forgiving toward one whom you think of as an enemy and one whom you consider as a friend."
"No-one can lose, and everyone MUST benefit. Each miracle is an example of what justice can accomplish, when it is offered to everyone alike. It is received and GIVEN equally. It IS awareness that giving and receiving ARE the same."
"the RECIPROCAL relationship of giving and RECEIVING will be recognized"