6:8-14 How dreadful, how miserable, is the case of those whose eternal ruin the Lord himself has sworn; for he can execute his purpose, and none can alter it! Those hearts are wretchedly hardened that will not be brought to mention God's name, and to worship him, when the hand of God is gone out against them, when sickness and death are in their families. Those that will not be tilled as fields, shall be abandoned as rocks. When our services of God are soured with sin, his providences will justly be made bitter to us. Men should take warning not to harden their hearts, for those who walk in pride, God will destroy.
12. In turning "judgment (justice) into gall (poison), and … righteousness into hemlock" (or wormwood, bitter and noxious), ye act as perversely as if one were to make "horses run upon the rock" or to "plough with oxen there" [Maurer]. As horses and oxen are useless on a rock, so ye are incapable of fulfilling justice [Grotius]. Ye impede the course of God's benefits, because ye are as it were a hard rock on which His favor cannot run. "Those that will not be tilled as fields, shall be abandoned as rocks" [Calvin].