Matthew 13:52 And he said to them, ‘Therefore every scribe who has been trained for the kingdom of heaven is like the master of a household who brings out of his treasure what is new and what is old.’
The scribes were just one part of the Jewish nation who were supposed to pass on the knowledge of the scriptures to others. They were the teachers.
If teachers only teach old ways, then society does not move on but is stuck in those old ways. But if new ways are taught, society can move forward.
Jesus wanted people to learn from the old scriptures as well as all the new information He was teaching the disciples. Some of the new information was hard for them to accept because many were caught up in the old ways.
Are you willing to listen to new ways, new information and sit and discuss whether it is right and correct?