Yeshuasboy
I took a quick look-see through the "Text Sermons" of John Newton here just to see if this "letter" was in there, and I found it not.
Therefore, not knowing if it was discussed previously (for I do not come to this site often), I would like to post it (Newton's short discourse concerning Godly disputations) up for Christ's, and our neighbor's, and brother's and sister's sake:
Here's the hyper-link: http://gracegems.org/Newton/144.htm