moonbase,
When he said 'I am come not to break the law, but to fulfill it,' the law he meant was the Torah, no other.
He comes to enact a law of His life. Him living within spontaneously regulates from within by following His indwelling life a highest level of morality, a righteousness which exceeds that of the scribes and Pharisees. Look at more of the passage you refer to.
"Therefore whoever annuls one of the least of these commandments, and teaches men so, shall be called the least in the kingdom of the heavens; but whoever practices and teaches them, he shall be called great in the kingdom of the heavens. For I say to you that unless your righteousness surpasses that of the scribes and Pharisees, you shall by no mean enter into the kingdom of the heavens." " (Matt. 5:19,20)
Our brother Paul pioneered into this experience and taught about
"the law of the Spirit of life in Christ Jesus." It is about Christ Himself living within, regulating, empowering, adjusting, leading, and enabling us to walk as sons of God fulfilling the just moral requirement of the law.
"There is now then no condemnation to those who are in Christ Jesus. For the law of the Spirit of life has freed me in Christ Jesus from the law of sin and of death. For that which the law could not do, in that it was weak through the flesh, God sending His own Son in the likeness of the flesh of sin and concerning sin, condemned sin in the flesh, that the righteous requirement of the law might be fulfilled in us, who do not walk according to the flesh but according to the spirit."
Nor is there any suggestion that Jesus expected his teaching to be carried on in written form.
This is not true. In His resurrection He appeared to John in His exalted state and said to him:
"What you see WRITE in a scroll and send it to the seven churches:
To Ephesus and to Smyrna and to Pergamos and to Thyatira and to Sardis and to Philadelphia and to Laodicea." (Rev. 1:11)
As you can see Jesus Christ instructed His disciple John the Apostle to
WRITE. And in the end of each letter Jesus says for all who have an ear to hear to hear what the Spirit says to the churches. [The churches represented as golden lampstands there].
"He who has an ear, let him hear what the Spirit says to the churches." (repeated seven times starting with
(2:7).
Nowhere does He FORBID writing in the four gospels.
And He predicts He will send
"scribes" as well as
prophets. Are they not to write anything? Scribes write and so do prophets.
"Therefore, behold, I send to you prophets and wise men and scribes. Some of them you will kill and crucify, and some of them you will scourge in your synagogues and persecute from city to city." (Matt. 23:34)
In the Bible's end,
through His servant John, Jesus Christ warns of changing what He has commanded to be WRITTEN in the book of Revelation.
"I testify to everyone who hears the words of the prophecy of this scroll: If anyone adds to them, God will add to him the plagues which are written in this scroll; and if anyone takes away from the words of the scroll of this prophecy, God will take away his part from the tree of life and out of the holy city, which are WRITTEN in this scroll." (Rev. 22:18,19)