This passage is often misinterpreted as eliminating all forms of teaching, preaching, or evangelism in the church age or future kingdom, whereas it specifically addresses the end of remedial instruction in knowing God among His covenant people, as all will possess inherent relational knowledge; another common error is reading it as universalism, suggesting automatic forgiveness and knowledge of God for every person regardless of faith, ignoring its context within God's redemptive plan for His chosen remnant under the New Covenant.
Jeremiah 31:34
King James Version (1769)
34 And they shall teach no more every man his neighbour, and every man his brother, saying, Know the Lord: for they shall all know me, from the least of them unto the greatest of them, saith the Lord: for I will forgive their iniquity, and I will remember their sin no more.
Jeremiah 31:34 prophesies the New Covenant where God will enable every member of His people, from the least to the greatest, to have intimate, personal knowledge of Him without needing others to teach the basics of knowing the Lord, because He will fully forgive their iniquity and remember their sin no more, transforming hearts through divine initiative and fulfilling this promise ultimately in Jesus Christ who inaugurates this covenant by His sacrificial death.