At this time he was waiting for a revelation from God in
   answer to the enquiries of the people; who probably thus
   delayed to make known his will, in order to shew them that
   Jeremiah did not speak of his own mind, but when and as he was
   directed.  The delay was also suited to give time for
   consideration, and to retard their rash project; and, as it
   would render them impatient, it tended to detect their
   hypocrisy, and to shew more clearly their determined rebellion
   against God.

  Ps 27:14  Isa 28:16  Hab 2:3