I've been reading a lot of Teilhard lately, so stuff I come across is going through that filter right now. Using the 5 mutable things that you listed, the development of the conscious self could be seen as a spiritual evolutionary process as one moves from matter forward to consciousness. The question asked is comes after consciousness and what will the future human being look like in that regard.
And being a Lover of God, where God is the only reality, the "essential self" would be seen as an activity of God. Which than makes the soul totally eternal, not corruptible in any manor, not changeable, infinite in nature and one with the widest reach of the cosmos while shining forth with the light of the Divine.
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