To experience yourself as separate from everything else in the universe. This is what it means to be human. It is what differentiates us from all other living entities. It is self awareness and it is an illusion into which we are born. A necessary illusion because, without it, the universe has no way to experience itself.
But an illusion nonetheless and this illusion exists in a reality that is whole, undivided and complete. The illusion of the two exists in a reality that is just the one. What this means for us as human beings is simply this, there is nothing in the universe that we can experience that is not, at every moment, speaking to us of this undifferentiated oneness.
To believe in the reality of the illusion is what stands between us and the awakened states of being that the universe longs for us to know. To transcend this illusion of separateness is the journey we embark upon when we finally come to see that the place we long to be can only be glimpsed by making the world around us as we would like it to be.