The soul...that is all there ever is....

I have been thinking constantly about the soul since I came up with my paper topic. Now though, my thoughts are consumed with Thomas Moore's idea that the soul is not able to be changed. Quite honestly, this is difficult for me to comprehend. Doesn't everything change? Some people are simply afraid of change so they deny the fact that it ever will- not that I know this from experience.... :) How does the soul not change if it goes through various chambers, always moving beyond a different vale? I understand the idea that we must learn to live with our feelings, even those that are disturbing, but do feelings not change the soul itself?