But after thy hardness and impenitent heart treasurest up unto thyself wrath against the day of wrath and revelation of the righteous judgment of God; But after thy hardness - Occasioned by thy long course of iniquity. And impenitent heart-produced by thy hardness, through which thou art callous to the calls and expostulations of conscience. Treasurest up - continuest to increase thy debt to the Divine justice, which will infallibly inflict wrath - punishment in the day of wrath - the judgment day, in which he will render to every man according to his works. The word treasure the Hebrew uses to express any kind of store or collection: - Treasure or plenty of rain. Deuteronomy 28:12 : The Lord shall open unto thee his good Treasure, to give the Rain unto thy land. Treasure of punishment. Deuteronomy 32:34, Deuteronomy 32:35 : Is not this sealed up among my Treasures? To me belongeth Vengeance and Recompense. Treasures of mines, i.e. abundance of minerals. Deuteronomy 33:19 : They shall suck of the Abundance of the seas, and of Treasures hid in the sand. So treasures of gold, silver, corn, wine, oil, etc., mean collections or an abundance of such things: the word is used by the Greek writers precisely in the same sense. By wrath we are to understand punishment, as in Romans 1:18; and it is used so by the very best Greek writers. See Kypke.
The treasure of wrath, in this verse, is opposed to the riches of goodness, in the preceding. As surely as thou despisest, or neglectest to improve the Riches of God's Goodness, so surely thou shalt share in the Treasures of his Wrath. The punishment shall be proportioned to the mercy thou hast abused.