15. Blessed is the people that know the joyful sound! they shall walk, O Jehovah! in the brightness of thy countenance.16. In thy name shall they daily rejoice; and in thy righteousness shall they glory.17. For thou art the glory of their strength; and in thy favor shall our horn be exalted.18. For to Jehovah is our buckler; and our King is to the Holy One of Israel.
15. Blessed is the people that know the joyful sound. Here the same train of reflection concerning the Church is pursued, not only because unbelievers are blind to the consideration of God's works, but also because the prophet has no other purpose in view than to inspire the godly with good hope, that they may with confidence rely upon God, and not be discouraged by any adversities from boldly calling upon him. It is declared that those are happy to whom it is given to rejoice in God; for although all men in common are sustained and nourished by his liberality, yet the feeling of his paternal goodness is far from being experienced by all men in such a manner as to enable them, from a certain persuasion that he is favorable to them, to congratulate themselves upon their happy condition. It is, therefore, a singular privilege which he confers upon his chosen ones, to make them taste of his goodness, that thereby they may be encouraged to be glad and rejoice. And, in fact, there is not a more miserable condition than that of unbelievers, when by their brutish insensibility they trample under foot the Divine benefits which they greedily devour; for the more abundantly God pampers them, the fouler is their ingratitude. True happiness then consists in our apprehending the Divine goodness which, filling our hearts with joy, may stir us up to praise and thanksgiving.
The prophet afterwards proves from the effect, that those who with joy and delight acknowledge God to be their father are blessed, because they not only enjoy his benefits, but also, confiding in his favor, pass the whole course of their life in mental peace and tranquillity. This is the import of walking in the light of God's countenance: it is to repose upon his providence from the certain persuasion that he has a special care about our well-being, and keeps watch and ward effectually to secure it. The expressions rejoicing in his name, and glorying in his righteousness, are to the same purpose. The idea involved in them is, that believers find in God abundant, yea more than abundant, ground to rejoice and glory. The word daily appears to denote steadfast and unwavering perseverance; and thus there is indirectly censured the foolish arrogance of those who, inflated only with wind and presuming on their own strength, lift up their horns on high. Standing as they do upon an insecure foundation, they must at length inevitably fall. Whence it follows, that there is no true magnanimity nor any power which can stand but that which leans upon the grace of God alone; even as we see how Paul (Romans 8:31) nobly boasts, |If God be for us, who can be against us?| and defies all calamities both present and to come.
17. For thou art the glory of their strength. The same sentiment is confirmed when it is declared, that God never leaves his faithful servants destitute of strength. By the appellation the glory of their strength, which is ascribed to him, is meant that they are always so sustained by his present aid as to have just ground to glory in him; or which amounts to the same thing, that his power appears always glorious in aiding and sustaining them. They are, however, at the same time, reminded of the duty of yielding to God all the praise of their being preserved in safety. If this is true as to the present life, it is much more truly applicable to the spiritual life of the soul. Farther, the more highly to magnify this instance of God's liberality, we are taught, at the same time, that it depends entirely upon his good pleasure, there being no other cause of it. Whence it follows, that they are wholly bound and indebted to Him who is induced by his free bounty alone to continue to extend to them his help.
18. For to Jehovah is our buckler. As the chief protection of the people was in the person of their king, it is here expressly shown, that the maintenance of the welfare of the faithful by his instrumentality is the gift of God. But it is to be noticed, that the prophet's mind was not so fixed upon this temporal and transitory kingdom as to neglect, at the same time, to consider the end of it, as we shall presently see. He knew that it was only on account of Christ that God made his favor to flow upon the head of the Church, and from thence upon the whole body. And, in the first place, while he calls the king metaphorically a buckler, -- a figurative expression frequently employed in Scripture, -- he confesses that when the people are defended by his hand and working, it is nevertheless done by the providence of God, and is thus to be traced to a higher source than human agency. The same thing is again repeated in the second clause, in which it is affirmed, that the king was given by God to govern the people; and that, therefore, the defense which comes from the king is a blessing of God. Moreover, we must remember that what is said of this kingdom, which was a shadow of something greater, properly applies to the person of Christ, whom the Father has given to us to be the guardian of our welfare, that we may be maintained and defended by his power.