Do you think Paul (or the other authors) always knew they were writing Scripture?

Peter recognizes Paul's letters as Scripture in 2 Peter 2:13, and Paul cites Luke as Scripture in 1 Timothy 5:8. If they didn't know at the time, it would have been interesting to hear Paul and Luke's reactions!

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