You are correct, there is a missing word.
It should read:
5. Then all thy bones shall say pridefully, "Who is like unto me? Have I not been too strong for mine adversaries? Have I not delivered MYSELF by mine own brain and body?"
I hope that helps.
Not sure who can correct this, but I am sure someone here can.
Courage Conquering Fear
Fuck em if they can't take a joke
Don't Like What I Say, Kiss My Ass