Okay, Aineo. What you are missing is this. Although, flesh consist of flesh and doesn't possess it. You, are made of flesh and you possess flesh. GOd is a spirit, likewise, He possesses his spirit and is self made.
If your question is how does spirit possess spirit? then spirit consists of spirit and does not possess. Just as your example of flesh and flesh.
But one the other hand. If your question is how does God possess spirit?
While flesh does not possess flesh, you Do. Just as God does possess His spirit, even though he is Spirit. He is not live a non thinking piece of flesh when ripped off your body is nothing. He is in control of His SPirit (body) just as you are in control of your flesh (body). This is not speculation friend.
Matthew 12:18 - Behold my servant, whom I have chosen; my beloved, in whom my soul is well pleased: I will put my spirit upon him, and he shall shew judgment to the Gentiles.
How can God send, what is not His? He says I will put my spirit (possessive). That is how...
With Love,
Snipe...