Well I have to ask. Do you believe the Holy Spirit inspired the NT authors to write the gospels and epistles? And if you do believe such then do you see the purpose.
However I already pointed out the regard Jesus Christ had for the written Word. He used it to rebuke Satan. He used the written word to instruct the disciples on His righteousness. Jesus also said:
Matthew 24:35King James Version (KJV)
35 Heaven and earth shall pass away, but my words shall not pass away.
You know what, Jesus was right. His Words did not and shall not pass away. Why? The were written down.
Also, another poster already pointed out to you the Risen and Glorified Christ instructed John to write down the letters to the 7 churches.
Revelation 1:
10 I was in the Spirit on the Lord's day, and heard behind me a great voice, as of a trumpet,
11 Saying, I am Alpha and Omega, the first and the last: and, What thou seest, write in a book, and send it unto the seven churches which are in Asia; unto Ephesus, and unto Smyrna, and unto Pergamos, and unto Thyatira, and unto Sardis, and unto Philadelphia, and unto Laodicea.
So there's that. First rule of holes…stop digging. Next you will be saying Jesus could not read. Hope you don't go there.
John 20:31 (NASB)
but these have been written so that you may believe that Jesus is the Christ, the Son of God; and that believing you may have life in His name.