The quote is:
Carnality is the attempt to do supernatural work with natural strength.
Well I looked up carnal at www.m-w.org. He are the definitions listed there:
1a: relating to or given to crude bodily pleasures and appetites
b: marked by sexuality
2 : BODILY, CORPOREAL
b : WORLDLY
I don't want to try to do what God wants me to do in my own strength.