Mighty things; rather, secret things (literally, inaccessible). It must be admitted that this introduction hardly corresponds to the sequel, which does not contain any special secrets, as we should have thought.
Either Jeremiah 33:2, Jeremiah 33:3 have been inserted by a later (inspired) editor, whose mind was absorbed in high thoughts of the latter days—for this view may be urged the style and phraseology, which are hardly those of the surrounding chapters, hardly those of Jeremiah; or else we must adopt Hengstenberg's perhaps over subtle suggestion, which, however, does not touch the question of the phraseology, "that throughout Scripture dead knowledge is not regarded as knowledge; that the hope of restoration had, in the natural man, in the prophet, as well as in all believers, an enemy who strove to darken and extinguish it; that therefore it was ever new," or, in the words of Jeremiah, "great and secret things, which thou knowest not."