And I will steal, of thy testimonies before kings [1] In these words he seems to believe that he is in possession of that which he formerly prayed for. Having said, "Take not away the word out of my mouths" and now, as if he had obtained what he requested, he rises up, and maintains he will not be dumb, even were he called upon to speak in the presence of kings. There can be no question that he affirms he would willingly stand forward in vindication of the glory of God in the face of the whole world. He selects kings, who are generally more to be dreaded than other men, and haughtily shut the mouths of God's witnesses. Sometimes, indeed, it happens we will not hold out even in the presence of men in the humblest ranks of life. The moment a man sets himself in opposition to the word of God, we instinctively shrink back from fear; and that boldness of speech, of which we boasted at first, instantly disappears: but our want of courage is most palpable when we are summoned before the thrones of kings. And this is the reason why David asserts, that he will not only hold out against enemies among the meanest of men, but also will remain firm and fearless before kings. These words inform us that we have profited well and truly by God's word, when our hearts are so completely fortified against the fear of man, that we do not dread the presence of kings, even though all the world attempts; to fill us with dejection and dismay. It is most unbecoming that God's glory should be obscured by their empty splendor.

Footnotes

1 - "Dr Delaney supposes that this is spoken in reference to Achish, king of Gath, whom David had instructed in the Jewish religion: but we have already seen that it is most likely that the psalm was compiled under the Babylonish captivity. But the words may, with more propriety, be referred to the case of Daniel, and other bold and faithful Israelites, who spoke courageously before Nebuchadnezzar, Belshazzar, and Darius. See the Books of Daniel, Ezra, and Nehemiah." -- Dr Adam Clarke.

I will speak of thy testimonies also before kings - In the presence of men of most elevated rank. I will not be ashamed to avow my belief in thy word before those in power - whether friendly or unfriendly to thee and to thy cause. I will not disguise my belief in thy truth with any desire to secure their favor; I will not be intimidated from expressing my faith by any dread of their frowns. Compare Matthew 10:18-19; Acts 4:19; Acts 5:29; Acts 26:2.

I will speak - before kings - Dr. Delaney supposes that this is spoken in reference to Achish, king of Gath, whom David had instructed in the Jewish religion; but we have already seen that it is most likely that the Psalm was compiled under the Babylonish captivity. But the words may with more propriety be referred to the case of Daniel, and other bold and faithful Israelites, who spoke courageously before Nebuchadnezzar, Belshazzar, and Darius. See the books of Daniel, Ezra, and Nehemiah.

I will speak of thy testimonies also before (d) kings, and will not be ashamed.
(d) He shows that the children of God should not permit their fathers glory to be obscured by the vain pomp of princes.

I will speak of thy testimonies also before kings,.... As very likely he did before Saul and his courtiers, before the king of Achish and the princes of the Philistines, when as yet he was not a king himself; and when he was come to the throne, such kings as came to visit him, instead of talking with them about affairs of state, he spoke of the Scriptures, and of the excellent things they bear witness of; and such a practice he determined to pursue and continue in;
and will not be ashamed; of the testimonies of God, and of the truths contained in them; and of speaking of them and for them; or of being reproached and vilified on that account. So the Apostle Paul was a chosen vessel to bear the name of Christ before kings; nor was he ashamed to speak of him and of his Gospel before Nero the Roman emperor, Agrippa king of the Jews, and before Felix and Festus, Roman governors; nor ashamed of the reproaches and afflictions he endured on that account.