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The prophet says expressly, that the city of God shall be glad, although it had no raging sea, but only a gently flowing stream, to set for its defense against those waves of which he has made mention. By this mode of expression he alludes to the stream which flowed from Shiloah, and passed through the city of Jerusalem. Further, the prophet, I have no doubt, here indirectly rebukes the vain confidence of those who, fortified by earthly assistance, imagine that they are well protected, and beyond the reach of all danger. Those who anxiously seek to strengthen themselves on all sides with the invincible helps of the world, seem, indeed, to imagine that they are able to prevent their enemies from approaching them, just as if they were environed on all sides with the sea; but it often happens that the very defenses which they had reared turn to their own destruction, even as when a tempest lays waste and destroys an island by overflowing it. But they who commit themselves to the protection of God, although in the estimation of the world they are exposed to every kind of injury, and are not sufficiently able to repel the assaults made upon them, nevertheless repose in security. On this account, Isaiah (Isaiah 8:6) reproves the Jews because they despised the gently flowing waters of Shiloah, and longed for deep and rapid rivers.

In that passage, there is an elegant antithesis between the little brook Shiloah on the one hand, and the Nile and Euphrates on the other; as if he had said, They defraud God of his honor by the unworthy reflection, that when he made choice of the city of Jerusalem, he had not made the necessary provision in respect of strength and fortifications for its defense and preservation. And certainly, if this psalm was written after the slaughter and flight of the army of Sennacherib, it is probable that the inspired writer purposely made use of the same metaphor, to teach the faithful in all ages, that the grace of God alone would be to them a sufficient protection, independent of the assistance of the world. In like manner, the Holy Spirit still exhorts and encourages us to cherish the same confidence, that, despising all the resources of those who proudly magnify themselves against us, we may preserve our tranquillity in the midst of disquietude and trouble, and not be grieved or ashamed on account of our defenseless condition, so long as the hand of God is stretched out to save us. Thus, although the help of God comes to our aid in a secret and gentle manner, like the still flowing streams, yet it imparts to us more tranquillity of mind than if the whole power of the world were gathered together for our help. In speaking of Jerusalem as the sanctuary of the tabernacles of the Most High, the prophet makes a beautiful allusion to the circumstances or condition of that time: for although God exercised authority over all the tribes of the people, yet he made choice of that city as the seat of royalty, from which he might govern the whole nation of Israel. The tabernacles of the Most High were scattered throughout all Judea, but still it was necessary that they should be gathered together and united in one sanctuary, that they might be under the dominion of God.