Jeremiah 31:34

They shall teach no more every man his neighbour... — We trace in that hope for the future the profound sense of failure which oppressed the mind of the prophet, as it has oppressed the minds of many true teachers since. What good had come of all the machinery of ritual and of teaching which the Law of Israel had provided so abundantly? Those repeated exhortations on the part of preachers and prophets that men should “know the Lord,” what did they present but the dreary monotony as of an “old worm-eaten homily”? To know Him, as indeed He is, required nothing less than a special revelation of His presence to each man’s heart and spirit, and that revelation was now, for his comfort, promised for all who were willing to receive it as the special gift of the near or distant future which opened to his view in his vision of a restored Israel. Here also the words of Jeremiah echo those of an older prophet (Isaiah 54:13), and find their fulfilment in those of Christ (John 6:45).

I will forgive their iniquity... — The second clause repeats the promise of the first, in a form which is, perhaps, from the necessity of the case, after the manner of men. Our thoughts of God as the All knowing preclude the idea of any limitation of His knowledge, such as the words “I will remember no more” imply. What is meant is that He will be to him who repents and knows Him as indeed He is, in His essential righteousness and love, as men are to men when they “forget and forgive.” He will treat the past offences, even though their inevitable consequences may continue, as though they had never been, so far as they affect the communion of the soul with God. He will, in the language of another prophet, “blot out” the sins which yet belong to the indelible and irrevocable past (Isaiah 43:25; Isaiah 44:22).