Jamieson, Fausset and Brown on Daniel 12:10

10. There is no need of a fuller explanation as to the time; for when the predictions so far given shall have come to pass, the godly shall be "purified" by the foretold trials and shall understand that the end is at hand; but the wicked shall not understand, and so shall rush on to their own ruin (Da 11:33-35) [Maurer]. The "end" is primarily, of Antiochus' persuasion; antitypically, the end of Antichrist's. It is the very clearness in the main which renders necessary the obscurity. The fulfilment of God's decree is not a mere arithmetical problem which the profane may understand by arithmetical calculations, but a holy enigma to stimulate to a faithful observance of God's ways, and to a diligent study of the history of God's people [Auberlen]. To this Christ refers (Mt 24:15), "Whose readeth, let him understand."