1. What they did that was good was not done aright (v. 5): You fasted and mourned. They were not chargeable with the omission or neglect of the duty, though it was displeasing to the body (thy fasts were continually before me, Ps. l. 8), but they had not managed them aright. Note, Those that come to enquire of their duty must be willing first to be told of their faults. And those that seem zealous for the outside of a duty ought to examine themselves faithfully whether they have the regard they ought to have to the inside of it. (1.) They had not an eye to God in their fasting: Did you at all fast unto me, even to me? He appeals to their own consciences; they will witness against them that they had not been sincere in it, much more will God, who is greater than the heart and knows all things. You know very well that you did not at all fast to me; in fasting did you fast to me? There was the carcase and form of the duty, but none of the life, and soul, and power of it. Was it to me, even to me? The repetition intimates what a great deal of stress is laid upon this as the main matter, in that and other holy exercises, that they be done to God, even to him, with an eye to his word as our rule, and his glory as our end, in them, seeking to please him and to obtain his favour, and studious by the sincerity of our intention to approve ourselves to him. When this was wanting every fast was but a jest. To fast, and not fast to God, was to mock him and provoke him, and could not be pleasing to him. Those that make fasting a cloak for sin, as Jezebel's fast, or by it make their court to men for their applause, as the Pharisees, or that rest in outward expressions of humiliation while their hearts are unhumbled, as Ahab, do they fast to God, even to him? Is this the fast that God has chosen? Isa. lviii. 5. If the solemnities of our fasting, though frequent, long, and severe, do not serve to put an edge upon devout affections, to quicken prayer, to increase godly sorrow, and to alter the temper of our minds and the course of our lives for the better, they do not at all answer the intention, and God will not accept them as performed to him, even to him. (2.) They had the same eye to themselves in their fasting that they had in their eating and drinking (v. 6): "When you did eat, and when you did drink, on other days (nay, perhaps on your fast-days, in the observation of which you could, when you saw cause, dispense with yourselves, and take a liberty to eat and drink), did you not eat for yourselves and drink for yourselves? Have you not always done as you had a mind yourselves? Why then do you now pretend a desire to know the mind of God? In your religious feasts and thanksgivings you have had no more an eye to God than in your fasts." Or, rather, it refers to their common meals; they did no more design the honour of God in their fasting and praying than they did in their eating and drinking; but self was still the centre in which the lines of all their actions, natural, civil, and religious, met. They needed not be in such care about the continuance of their fasts, unless they had kept them better. Note, We miss our end in eating and drinking when we eat to ourselves and drink to ourselves, whereas we should eat and drink to the glory of God (1 Cor. x. 31), that our bodies may be fit to serve our souls in his service.