Paul Admits Often That He Is Uninspired

Paul made explicitly clear that he said many things that were not inspired in his letters. However, when speaking for the Lord, Paul made it clear that "the Lord" gave him the message, as was an OT requirement to be treated as inspired-writ. See 1 Cor. 14:37; 1 Tim. 2:11; 1 Cor. 2:13; 1 Thess.4:1-2,8; 1 Thess. 2:13; Eph. 4:17. cf. 1 Cor. 7:25, 40.

Here are examples that Paul emphasized he was speaking on his own in his letters. Hence, Paul cannot be viewed as Scripture that is inspired in every word, for Paul denies for himself that very same interpretation.

First, in Paul's own words, he once said  "I speak not by Commandment ... and herein I give my advice" (2 Cor. 8: 8-10). Paul's calling his words "advice" certainly did not mean it was the Word of God.

Likewise, in this next quote from 1 Corinthians, note the two different sources of the commands which Paul has written:  "Unto the married I command, yet not I,  but the Lord .., but the rest is from me, not from the Lord” (I Cor. 7:10-12). Paul in saying this did what OT principles required for recognition of a statement as inspired -- he said the message was from "the Lord."

Finally, here is another quote which definitely tells us that some of Paul's utterances and admonishments were of his own making: “Now concerning virgins I have no commandment of the Lord:  but I give my own opinion” (1 Cor.7:25 ). See also 2 Cor. 11:17 ("What I am going to say now, is not prompted by the Lord, but said as if in a fit of folly, in the certainty that I have something to boast about”)

Hence, Paul did not understand he was always speaking under inspiration. When he wanted that understood, Paul followed the OT requirement of saying the "Lord" burdened him with a message.

Did Paul Express A Broader Understanding?

However, one time Paul make a statement that appears more sweeping. In 1 Cor 14:37-38, Paul writes: "If anyone thinks he is a prophet or spiritual, let him recognize that the things which I write to you are the Lord’s commandment. But if anyone does not recognize this, he is not recognized." Presumably, if you are not recognized, you are not accepted by Paul. You are excluded. So Paul made his own words a test to exclude Christians from the communion of Christians at Corinth.

One commentator applied these words to Paul's words on women as teachers. It said: "Any one who rejects Paul’s teaching on the submission of women and woman preachers, is 'not recognized' by God... or condemned. Harsh but true words." ("May Women Teach.")

However, I have two objections to how broad to read Paul's statement. First, it is inconsistent with Paul's own words that he is not always speaking under inspiration, and he points that fact out. Second, Paul in context meant at most that "this" commandment he gave was from God, i.e., his preceeding command to have one speak and another be silent during prophesying. The threat upon the one who does not "recognize this" did not mean to encompass all "the things which I write...." The emphasis is thus misplaced by this commentator.

Hence, our conclusion above remains. Paul made it clear when he believed he spoke for the Lord. This is one of those passages. This was an OT requirement to have words taken as prophetic. They had to be said to be from the Lord. Otherwise, Paul's own self-assessments show us he did not expect us to take his letters as inspired.

Moreover, it is clear he was trying to persuade, citing often his interpretation of OT passages such as Habakkuk and Genesis. Why would a person whose every word is inspired do this?

Thus, we can safely conclude that unless Paul says God burdened him with a message that he is no more inspired than C.S.Lewis who writes a piece to persuade us.

Paul himself even expressed uncertainty whether he had God's spirit to prophesy: “I THINK that I have the Spirit of God” (1 Cor. 7:40).

So we can say this means we cannot take everthing Paul utters as prophesy even if sometimes he were inspired.

Paul Could Not Regard His Letters As Inspired or Otherwise Why is Letter to Corinthians Lost?

A defender of Paul as properly in canon mentions this lost letter of Paul. This is how he tries to rationalize why this is lost:

Not everything Paul (or the others) wrote was inspired and intended to be recognized as Scripture. Peter and John determined which were to become a part of the canon. Paul, for example, makes reference to at least one additional letter which was not included (1 Corinthians 5:9) (Ernest L. Martin, The Original Bible Restored (1984).)