“Your brother does not exist apart from you, nor you from your brother. This is reality.” (ACOL, 6.2)
This quotation builds on the idea of joining with our brothers and sisters, One unity in the diversity of different entities in relationship. Here we learn that we do not actually exist separately from our brother or brother at all, but are One with him or her. Jesus says simple, “This is reality.”
This is another way of saying that God is not existent in separate realities in a pantheistic universe, with little gods in everything. We believe that we are part of God, that He differentiated His “God-stuff” into all that exists. And we in turn are meant to be co-creators with Him.
We were not designed to be alone, and that is one reason that the egoic choice was so destructive to us. The ego wants us alone, ourselves against the world, One in nothing. And we suffer in this pseudo-independence, because it is not a state of reality at all. It is a false concept of reality that will not hold stand up to testing. We know intuitively that there is another way, a better way to live, and when we are joined one to the other, we know that we are right in this knowledge.
So we are to join in holy relationship with each other. Never meant to be separate from our companions, we cease trying.
And we are much the better for giving up what would never work, anyway.