We divide ourselves up into spirit and human, but essentially we are all a part of the same world.
The world is a living being - one nature, one soul. Keep that in mind.
While I know myself as a creation of God, I am also obligated to realize and remember that everyone else and everything else are also God's creation.
If you can break the illusion that you are separate and begin to experience the oneness of the existence, that is yoga.
The essence of Vedanta is that there is but one Being and that every soul is that Being in full, not a part of that Being.
My father used to say: Every bird is one bird, and every book is one book, and every bird and every book is one thing too, under the words and the feathers." He finished with a flourish, as though the meaning of this was self-evident.
If you are anxious about death, then you don't have a sense of the oneness of things - you feel that after death, you will be no more.