That's God working through one that are counted as worthy of God, but of our own works we are but like filthy rags.
So it's not me myself that does the works but he who is God I abide in, is the point.
One who takes pride in himself work is in vain ! it's he who is above that is the glory that one shall give such to.
Without God you can do nothing.
The works of Man is rubbish, such as that is a ship without a rudder, not to mention history proves that such always crashes badly, as they are clearly a ship of fools.