Moses spent several periods of 40 days in supernatural communion with God. Then he taught the Jewish people for 40 years before he wrote scrolls for them to have a permanent ‘Cliff Notes’ of what he had taught them.
The Church, claiming to be the successor of Jesus (who it is claimed succeeded Moses) follows the pattern of Moses: First the teaching, then the written reminder.
But that's wrong. First it was Jesus doing the teaching and then HE promised the Holy Spirit who would bring to their remembrance what He taught.
The *Church* had nothing to do with it.
John 14:25-26 25 “These things I have spoken to you while I am still with you. 26 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 have said to you.