To answer your question: Jonathan Edwards!

His approach to the problem of sin is interesting - I am just reading it here:

http://www.ccel.org/ccel/edwards/works1.vi.iii.i.vi.html

Basically in a nutshell cause wading through that english is tough going he says that if we love God then to give in to the temptation to sin is to show the hugest amount of ingratitude and disrespect for the work of the cross and the Love God showed us.

I believe that we continue to struggle with the temptation to sin but that we have the tools and strength to resist it.

"I can do ALL things through Christ who strengthens me"