As I said in the body of this work, Hebrews 10:24-25 is key.
This chapter comprises my brief comments on three sermons
which John Piper preached on the passage, sermons in which
he made (though not always strongly enough) a valuable
contribution to this discussion.
I start with a sermon Piper preached in 1997, in which he
spoke of the command for believers to 'get together and
encourage one another'. Piper:


Link to New-Covenant Theology Made Simple Audio:
http://www.sermonaudio.com/search.asp?sortby=added&sourceonly=true&currSection=sermonssource&keyword=davidhjgay&subsetcat=series&subsetitem=NC+Theology+Made+Simple

You can find other materials such as sermons, books, audio books, and articles at David H J Gay website:
http://www.sermonaudio.com/source_detail.asp?sourceid=davidhjgay

And on Amazon and Kindle you will find more books:
http://www.amazon.co.uk/David-H.-J.-Gay/e/B00491BI2U
http://www.amazon.com/David-H.-J.-Gay/e/B00491BI2U

THE WRITINGS OF DAVID H.J. GAY
http://christmycovenant.com/?s=david+hj+gay&x=9&y=8