What could be the reason for Jesus not telling His disciples to write down whatever He was teaching them? What could be the reason for Jesus not telling His disciples to write down whatever He was teaching them?  

He knew His mission here was to bring the Kingdom of God and He knew that the teaching He was imparting to the masses was extraordinary and unparalleled in the history of the world. Recently one member of this site mentioned and it could be true, that in a day whatever He was teaching His followers, would fit into one whole New Testament.  However, we find no record anywhere of Jesus telling His followers to record all that He was teaching them. He however said that when Holy Spirit comes He would teach them everything. Was His plan already in place?
1) Don't assume that Jesus neglected to instruct his disciples on this matter.  There are many things Jesus said and did that are not recorded in Scripture.  (The vast majority in fact.)


  And there are also many other things which Jesus did, which if they were written in detail, I suppose that even the world itself would not contain the books that would be written. -John 21:25


2) God's plan was for them to hear the words of Jesus, and then later be reminded of them by the Spirit, who would inspire them to write.


  But the Helper, the Holy Spirit, whom the Father will send in My name, He will teach you all things, and bring to your remembrance all that I said to you. -John 14:26