Jürgen Moltmann's The Power for the Powerless: The Word of Liberation For Today is a collection of sermons I'm reading that was recommended by the moltmanniac.com. The following quotation is from the fifth sermon, The New Covenant of Freedom (Jeremiah 31:31-34).
"The days are surely coming, says the Lord, when I will make a new covenant with the house of Israel and the house of Judah. It will not be like the covenant that I made with their ancestors when I took them by the hand to bring them out of the land of Egypt—a covenant that they broke, though I was their husband, says the Lord. But this is the covenant that I will make with the house of Israel after those days, says the Lord: I will put my law within them, and I will write it on their hearts; and I will be their God, and they shall be my people. No longer shall they teach one another, or say to each other, “Know the Lord,” for they shall all know me, from the least of them to the greatest, says the Lord; for I will forgive their iniquity, and remember their sin no more." (NRSV Jeremiah 31:31-43)
Sermons will be superfluous. No one will have to preach them and no one will have to listen to them. Church will be superfluous. No one will have to attend services or pay their financial dues. Clergy, teachers, professors and students of theology will be superfluous. The theological faculties can be closed down. The teaching ministry of the church will be superfluous, whether it is fallible or infallible, or Rome, Tübingen, or wherever it may be. The Bible, both the Old and the New Testaments, the interpration of Scripture and the disputes about the Bible will all be superfluous. It is all superfluous, and it all comes to an end, once it has achieved its purpose, when - yes, when 'the days come' in which God will make the new, final, indestructible covenant with men and women. When God will write his law in their hearts; when God will be our God in our inmost being; when we become his people with all our hearts, then, 'No one will teach and preach to the other any longer, saying "Know the Lord", for they shall all know him, face to face, from the greatest of them to the least.
Moltmann, Jürgen. The Power of the Powerless: The Word of Liberation For Today. Trans. Margaret Kohl. San Francisco: Harper & Row, 1983. 38-9. Print.