Thank you for including verse 8. Most people only quote up through verse 7, making the impact of the teaching that we should constantly cry out to God. Which is true...and definitely part of the point of this passage. But that last part really brings home the point that this crying out to God IS faith.

There is another passage that says essentially that anything that is not of faith is sin. And another passage that states that without faith it is impossible to please God.

We tend to get so focused on keeping all the rules that we miss the entire concept of faith - simply defined as acting like what God said is true and that we believe it. If we really believed it we would have different behavior - not so much that we wouldn't commit sins but be at peace, trust Him and cry out to Him because we believe He will do something.

This last verse encompasses all of that. Will anyone even believe Him enough to be praying? The rhetorical answer is "no" or "barely".