2. that prophesy--namely, a speedy return to Jerusalem.
      out of . . . own hearts--alluding to the words of Jeremiah (Jer 23:16, 26); that is, what they prophesied was what they and the people wished; the wish was father to the thought. The people wished to be deceived, and so were deceived. They were inexcusable, for they had among them true prophets (who spoke not their own thoughts, but as they were moved by the Holy Ghost, 2Pe 1:21), whom they might have known to be such, but they did not wish to know (Joh 3:19).

JFB.