Great verse, I think about this almost every day as I try to do what I think God wants me to do, and I inevitably think about the "good" I am doing, I then rebuke myself because it is not my accomplishment to claim, for without the strength, life, mind, will, and faith that He put in me, I would not be able to accomplish any of it.

It also reminds me of a great quote from CS Lewis which puts it another way:

“Every faculty you have, your power of thinking or of moving your limbs from moment to moment, is given you by God. If you devoted every moment of your whole life exclusively to His service you could not give Him anything that was not in a sense His own already. So that when we talk of a man doing anything for God or giving anything to God, I will tell you what that is really like.

It is like a small child going to it’s father and saying, ‘Daddy, give me sixpence to buy you a birthday present.’ Of course, the father does, and he is pleased with the child’s present. It is all very nice and proper, but only an idiot would think that the father is sixpence to the good on the transaction. When a man has made these two discoveries God can really get to work. It is after this that real life begins. The man is awake now.”

C. S. Lewis (1898-1963) in Mere Christianity (New York: HarperCollins, 2001) 192.