I'd beg to differ. First comes the desire to respond, but to actually respond requires an ability to carry out the response. I believe God provides both. I am just restating the content of these two verses:
And God is able to make all grace abound to you, so that having all sufficiency in all things at all times, you may abound in every good work. 2 Corinthians 9:8 (ESV)
Therefore, my beloved, as you have always obeyed, so now, not only as in my presence but much more in my absence, work out your own salvation with fear and trembling, for it is God who works in you, both to will and to work for his good pleasure. Philippians 2:12–13 (ESV)
The first verse tells us it is God who provides grace so that we are sufficient to do good works.
The second verse tells us it is God who is the agent behind our good desire and ability to do His will. We are to work very hard on our salvation all the while recognizing it is God that is providing us the will - our desire/motivation - and the ability "to do" His "good pleasure".
You see, with this view a person truly has no grounds for boasting, but if we place ourselves as a key ingredient to God's work, then we can't help but have reason to boast. We have no reason to boast.