17:1-21 Here was a wonderful effect of Divine Providence blinding Absalom's mind and influencing his heart, that he could not rest in Ahithophel's counsel, and that he should desire Hushai's advice. But there is no contending with that God who can arm a man against himself, and destroy him by his own mistakes and passions. Ahithophel's former counsel was followed, for God intended to correct David; but his latter counsel was not followed, for God meant not to destroy him. He can overrule all counsels. Whatever wisdom or help any man employs or affords, the success is from God alone, who will not let his people perish.
13. all Israel shall bring ropes to that city—In besieging a town, hooks or cranes were often thrown upon the walls or turrets, by which, with ropes attached to them, the besiegers, uniting all their force, pulled down the fortifications in a mass of ruins.