He spent three years saying "...it is written."

Jesus said He had come to fulfill the law and the prophets with Psalms and Proverbs available to Him. But without this collection of writing, would he have found it necessary or important to summarize the law and the prophets into two simple points?  If He did not have such a great collection of writings, what would have been His source of learning and wisdom and would He have written His own book of wisdom?  We have His summary and teachings on the law and prophets from those who lived and worked with Him, nothing more, because He(Jesus) said the law and the prophets were enough. They are enough to inspire and any gospel must be consistent with the law and the prophets in the old testament.  Jesus rose from the tomb as a Jew. Read John 4 and John 17. He quoted nothing else and taught from no other source. They are enough to inspire faith in a human community based on Jehovah's natural law.  See Ecclesiastes 12.  The teachings of Paul the apostle and the disciples confirm this.