Where is Paul's Romans 7 question about the believer's struggle with the old nature answered?

Les explains that in Romans 7 Paul asks how he can do what the new nature wants when the old nature keeps tipping the balances. Les points out that this question is going to be answered in the next chapter, chapter 8. He notes that the first seven chapters have only one reference to the Holy Spirit, but chapter 8 mentions the Holy Spirit about nineteen times. Les also emphasizes that from the old Adamic nature's point of view there is nothing good, and that a believer must say, 'In myself I am nothing, but in Christ I can become anything.'