"He said to them, โTherefore every scribe who has been made a disciple in the Kingdom of Heaven is like a man who is a householder, who brings out of his treasure new and old things.โ" (Matthew 13:52)
Old and New
Jesus concludes His parables by describing the ideal teacher. The "old" treasures are the truths of the Old Testament/Law. The "new" treasures are the revelations of Jesus and the Gospel.
A true disciple doesn't discard the old for the new, nor reject the new for the old. He understands how Christ (the New) fulfills the Law (the Old).
Key Lesson: We must value both the deep roots of Scripture (Old Testament) and the fresh revelation of Christ (New Testament) to have a complete faith.