Many fail to realize that these were the foundational teachings of the New Covenant. It was initiated in the Blood of Jesus, but the basis of it's way and blessings is found in John 13-17. Notice the pattern of the first mention of the Holy Spirit coming in permanence to the believer in chapters 14 and 16, wrapped around the core of what should be the believers life...abiding in Jesus (John 15:5-7).
