So much that he wrote is just plain wrong
How astounding is this: one of the founding heroes of the Christian faith wrote letters—he was obsessive about it—and we still have those letters today. Actually, the originals were lost, so we have copies of copies of copies, many generations of copies removed from the originals. Which means that quite a few errors crept into the text—some words also got left out by mistake—but it’s still quite something that we have what we do. For anyone who is genuinely curious about what Christian thought was like, right at the beginning, these letters are a treasure, preserved in the New Testament. It is a curiosity that Jesus himself didn’t think of writing letters, to codify his insights about God. After all, he was part of God himself, the divine trinity. If not letters, why not treatises? Just preaching words that evaporated into the air as he wandered Palestine seems so inadequate. Moreover, the Jesus-script that we have in the gospels probably was invented by their authors, writing decades later: there’s no way to verify any of the words attributed to Jesus. But, hey, the gospel writers had firmly held theological ideas about Jesus. So they’re worth reading, right?