Wes,

Thanks. I guess it's just amazing that the Lord would use an unsaved man in writing Scripture.

Would you say Solomon turned away from the Lord (i.e. fell into grievious sin), or did he commit apostasy?

Robert Shaw writes in his commentary on the WCF's section on perseverance:

Quote
When it is said of Solomon, that "he went not fully after the Lord, as did David his father" (1 Kings xi. 6.), it seems manifest, that his declension is to be understood of an abatement of his former zeal, and not of a total and final apostasy. God, as still his father, "chastened him with the rod of men, and with the stripes of the children of men;" but never suffered a his mercy to depart away from him."—2 Sam. vii. 14, 15.

If Shaw is correct, then shows a true testimony to God's grace and justification by faith alone.

But then, what of Solomon's lack of repentence?

True godliness is a sincere feeling which loves God as Father as much as it fears and reverences Him as Lord, embraces His righteousness, and dreads offending Him worse than death~ Calvin