Harden not your hearts, as in the provocation, in the day of temptation in the wilderness:
Ver. 8. Harden not your hearts] Some hearts are so hard that neither ministry, nor misery, nor miracle, nor mercy can possibly mollify them. Such a heart is in some respects worse than hell. And if God broke David's bones for his adultery, and the angels' backs for their pride, the Lord, if ever he save any, will break his heart too. As when he marks out a man for eternal misery, he denies him his grace; and then the sinner hardens his own heart by his own inward depravity. Like as when an owner denies to prop up or repair a ruinous reeling house, the house falls by its own ponderousness.