2. That, forasmuch as they would not be made better by his ministry, they should be made worse by it; those that were wilfully blind should be judicially blinded (v. 10): "They will not understand or perceive thee, and therefore thou shalt be instrumental to make their heart fat, senseless, and sensual, and so to make their ears yet more heavy, and to shut their eyes the closer; so that, at length, their recovery and repentance will become utterly impossible; they shall no more see with their eyes the danger they are in, the ruin they are upon the brink of, nor the way of escape from it; they shall no more hear with their ears the warnings and instructions that are given them, nor understand with their heart the things that belong to their peace, so as to be converted from the error of their ways, and thus be healed." Note, (1.) The conversion of sinners is the healing of them. (2.) A right understanding is necessary to conversion. (3.) God sometimes, in a way of righteous judgment, gives men up to blindness of mind and strong delusions, because they would not receive the truth in the love of it, 2 Thess. ii. 10-12. He that is filthy let him be filthy still. (4.) Even the word of God oftentimes proves a means of hardening sinners. The evangelical prophet himself makes the heart of this people fat, not only as he foretels it, passing this sentence upon them in God's name, and seals them under it, but as his preaching had a tendency to it, rocking some asleep in security (to whom it was a lovely song), and making others more outrageous, to whom it was such a reproach that they were not able to bear it. Some looked upon the word as a privilege, and their convictions were smothered by it (Jer. vii. 4); others looked upon it as a provocation, and their corruptions were exasperated by it.