Wherefore should the heathen say, Where is now their God?

For thy mercy, and for thy truth's sake: lest the gentiles should say: Where is their God?

Why should the heathen say, Where is now their God? They here express how God would maintain his glory in the preservation of the Church, which, if he permitted to be destroyed, would expose his name to the impious reproaches of the heathen, who would blaspheme the God of Israel, as being destitute of power, because he forsook his servants in the time of need. This is not done from the persuasion that God requires any such representation, but rather that the faithful may direct their thoughts back to that holy zeal contained in the words to which we have formerly adverted, "The railings of those that railed against thee have fallen upon me," Psalm 69:10. And this is the reason for not having recourse to rhetorical embellishment, to move him to put forth his power to preserve the Church; they simply protest that their anxiety for their own safety does not prevent them from valuing the glory of God, even as it is worthy of being more highly valued. They go on to show how the glory of God was connected with their deliverance, by declaring that he was the Author of the covenant, which the ungodly had boasted was abolished and disannulled; and who, consequently, had declared that the grace of God was frustrated, and that his promises were vain. This is the ground on which they remind him of his favor and faithfulness, both of which were liable to mischievous calumnies, should he disappoint the hopes of his people, to whom he was bound by an everlasting covenant; and upon whom, in the exercise of his gratuitous mercy, he had bestowed the privilege of adoption. And as God, in making us also partakers of his Gospel, has condescended to graft us into the body of his Son, we ought to make a public acknowledgement of the same.

Wherefore should the heathen say - The nations; they who worshipped idols, and who claimed that those idols were true gods. Why should we, thy people, be so left, so forsaken, so afflicted, as to lead these idolaters to suppose that we worship a false God, or that the God whom we adore is destitute of power or faithfulness; either that he does not exist, or that he cannot be relied on. It is evident that they were now in circumstances which would give some plausibility to the question here asked.
Where is now their God? - They seem to be forsaken. God, the God whom they worship, does not come forth for their defense. If he exists at all, he is destitute of power, or he is not true to the people who worship him, and he cannot be trusted. Compare Psalm 42:3, note; Psalm 42:10, note; Psalm 79:10, note.

Wherefore should the heathen say - This appears to refer to a time in which the Israelites had suffered some sad reverses, so as to be brought very low, and to be marked by the heathen.

Wherefore should the heathen say, (b) Where [is] now their God?
(b) When the wicked see that God does not always accomplish his promise as they imagined, they think there is no God.

Wherefore should the Heathen say,.... The nations about Israel, the nations of the world; the Gentiles in any age; the Papists in ours, sometimes called the Heathen, Psalm 10:16. The church expostulates with the Lord why those should be suffered to say, in a reproachful, insulting, manner, and by way of triumph,
where is now their God? that they have boasted of would help them; in whom they have put their trust and confidence; why does not he help them, as he has promised, and they expect? Thus the church suggests, that if the Lord did not appear for them, his own glory lay at stake. Such language is generally used by their enemies, when the people of God were in any distress; see Psalm 42:10.

Where is now, &c.--"now" is "not a particle of time, but of entreaty," as in our forms of speech, "Come now," "See now," &c.