John Wesley on 2 Samuel 18:33

Over the gate - Retiring himself from all men and business, that he might wholly give up himself to lamentation. My son - This he might speak from a deep sense of his eternal state, because he died in his sins, and because David himself had by his own sins been the occasion of his death. But it seems rather to be the effect of strong passion, causing him to speak unadvisedly with his lips.