Sinclair Ferguson has a very helpful article on inerrancy, that I agree with completely… until the last point. Why do people insist on understanding the closing of the canon like this? Taken this way, the closing of the canon must have had a more profound effect on the daily lives of saints than ever the Day of Pentecost did.
You can almost hear the shattering echo of a giant door being slammed as John penned the final “amen” of Revelation, and someone saying, “The passage is blocked behind us now, and there is only one way out – on the other side of the mountains. I fear from the sound that boulders have been piled up, and the trees uprooted and thrown across the gate. I am sorry; for the trees were beautiful, and had stood so long.”
It’s all so unnecessary, too, because scripture and prophecy were never the same thing. Not all scripture is prophecy, and even in scripture, not every prophecy is recorded. There is only one recorded prophecy from any of the sons of prophets that met with Elisha before Elijah had ascended. They told him that Elijah was going to be taken that day, which Elisha already knew. A whole school of them, and no significant prophecies recorded, neither from the sons, nor from the fathers. Twice Saul got caught up with a school of prophets and prophesied with them till the next morning, and we have received not a word of what they said in scripture. Philip the evangelist had four daughters who prophesied, and yet not one word that they said was ever scripture.
There’s simply no reason to think that all this prophesying that was not adding to scripture before the canon was closed should suddenly be understood as adding to scripture after the canon was closed. Prophecy and scripture are simply two separate things. So it is extremely unhelpful to take the testimony of scripture about what spirit-directed life must look like in the light of Pentecost and de-normalize it, especially in support of a doctrine like inerrancy.