Thief
Rogue Theologian
The issue is not a question of choice between what you call 'spirit' and 'substance'. That you think it is has set your course in amber, and round and round you will go, first leaning to spirit, then to substance, then back again, ad infinitum, until you awaken to the absurdity of it all. The inner war between the flesh and the spirit is a completely concocted illusory scenario, but then projected outwardly into the world as the cause of untold human misery.
In terms of mind and heart Someone had to be First.
I believe that to be the Almighty.
Then deciding if He is Creator?....of course.
Spirit First.