Jesus said that it was good for Him to leave this earth so that the Father could send the Holy Spirit to dwell in man. He would take the truth of the cross of salvation and reveal it to man through the Scriptures. No longer would we need teachers for God Himself would reveal Himself to us.
There are four provisions of the new covenant: (1) God’s law will be written on believers’ minds and hearts. This is in contrast to the Mosaic Law which was written on tablets of stone. (2) Believers will have a relationship with God fulfilling the promise of Lev. 26:12. (3) All will know God. No longer will Pharisees and scribes have to teach the intricacies of the Law to the people. (4) God will forgive the sins of believers and remember them no more.
Hebrews 8:10-12
10 For this is the covenant that I will make with the house of Israel after those days, says the Lord: I will put My laws in their mind and write them on their hearts; and I will be their God, and they shall be My people. 11 None of them shall teach his neighbor, and none his brother, saying, ‘Know the Lord,’ for all shall know Me, from the least of them to the greatest of them. 12 For I will be merciful to their unrighteousness, and their sins 2and their lawless deeds I will remember no more.”