I was dumb Here David blames himself, because he had not preserved that silence which, as we have already seen, the violence of his grief forced him to break. When he says then that he was dumb, he does not mean this as a commendation of the uniform and persevering restraint which he had exercised over himself. It is rather a correction of his error, as if reproving his own impatience, he had spoken within himself in this way: What doest thou? thou hadst enjoined upon thyself silence, and now thou murmurest proudly against God; what wilt thou gain by this presumption? We have here a very profitable and instructive lesson; for nothing is better fitted to restrain the violent paroxysms of grief, than the recollection that we have to do, not with a mortal man, but with God, who will always maintain his own righteousness in opposition to all that men may say against it in their murmuring complaints, and even in their outrageous accusations. What is the reason why the great majority of men run to such excess in their impatience, but because they forget that, in doing so, they dare to plead a controversy with God? Thus, while some impute all their miseries to fortune, and others to men, and others account for them from a variety of causes which their own fancy suggests, while scarcely one in a hundred recognises in them the hand of God, they allow themselves to indulge in bitter complaint, without ever thinking that in so doing they offend God. David, on the contrary, in order to subdue every unholy desire and sinful excess, returns to God, and resolves to keep silence, because the affliction which he is now suffering proceeded from God. As David, who was thus afflicted with the severest trials, resolved nevertheless to keep silence, let us learn from this, that it is one of the chief exercises of our faith to humble ourselves under the mighty hand of God, and to submit to his judgments without murmuring or complaint. It is to be observed, that men humbly and calmly submit themselves to God only when they are persuaded, not only that he does by his almighty power whatever he pleases, but that he is also a righteous Judge; for although the wicked feel that the hand of God is upon them, yet as they charge him with cruelty and tyranny, they cease not to pour forth horrible blasphemies against him. In the meantime, David regards the secret judgments of God with such reverence and wonder, that, satisfied with his will alone, he considers it sinful to open his mouth to utter a single word against him.

I was dumb - See the notes at Psalm 39:2. Compare Isaiah 53:7. The meaning here is, that he did not open his mouth to complain; he did not speak of God as if he had dealt unkindly or unjustly with him.
I opened not my mouth - I kept entire silence. This would be better rendered, "I am dumb; I will not open my mouth." The meaning is, not that he had been formerly silent and uncomplaining, but that he was now silenced, or that his mind was now calm, and that he acquiesced in the dealings of Divine Providence. The state of mind here, if should be further observed, is not that which is described in Psalm 39:2. There he represents himself as mute, or as restraining himself from uttering what was in his mind, because he felt that it would do harm, by encouraging the wicked in their views of God and of his government; here he says that he was now silenced - he acquiesced - he had no disposition to say anything against the government of God. He was mute, not by putting a restraint on himself, but because he had nothing to say.
Because thou didst it - thou hast done that which was so mysterious to me; that about which I was so much disposed to complain; that which has overwhelmed me with affliction and sorrow. It is now, to my mind, a sufficient reason for silencing all my complains, and producing entire acquiescence, that it has been done by thee. That fact is to me sufficient proof that it is right, and wise, and good; that fact makes my mind calm. "The best proof that anything is right and best is that it is done by God." The most perfect calmness and peace in trouble is produced, not when we rely on our own reasonings, or when we attempt to comprehend and explain a mystery, but when we direct our thoughts simply to the fact that "God has done it." This is the highest reason that can be presented to the human mind, that what is done is right; this raises the mind above the mysteriousness of what is done, and makes it plain that it should be done; this leaves the reasons why it is done, where they should be left, with God. This consideration will calm down the feelings when nothing else would do it, and dispose the mind, even under the deepest trials, to acquiescence and peace. I saw this verse engraved, with great appropriateness, on a beautiful marble monument that had been erected over a grave where lay three children that had been suddenly cut down by the scarlet fever. What could be more suitable in such a trial than such a text? What could more strikingly express the true feelings of Christian piety - the calm submission of redeemed souls - than the disposition of parents, thus bereaved, to record such a sentiment over the grave of their children?

I was dumb, I opened not my mouth; because (g) thou didst [it].
(g) Seeing my troubles came from your providence, I ought to have endured them patiently.

I was dumb, I opened not my mouth,.... This refers either to his former silence, before he broke it, Psalm 39:1, or to what he after that came into again, when he had seen the folly of his impatience, the frailty of his life, the vanity of man, and all human affairs, and had been directed to place his hope and confidence in the Lord, Psalm 39:5; or to the present frame of his mind, and his future conduct, he had resolved upon; and may be rendered, "I am dumb"; or "will be dumb, and will not open my mouth" (e); that is, not in a complaining and murmuring way against the Lord, but be still, and know or own that he is God;
because thou didst it; not "because thou hast made me", as Austin reads the, words, and as the Arabic version renders them, "because thou hast created me"; though the consideration of God being a Creator lays his creatures under obligation as to serve him, so to be silent under his afflicting hand upon them; but the sense is, that the psalmist was determined to be patient and quiet under his affliction, because God was the author of it; for though he is not the author of the evil of sin, yet of the evil of affliction; see Amos 3:6; and it is a quieting consideration to a child of God under it, that it comes from God, who is a sovereign Being, and does what he pleases; and does all things well and wisely, in truth and faithfulness, and in mercy and loving kindness: this some refer to the rebellion of Absalom, and the cursing of Shimei, 2-Samuel 12:11; or it may refer to the death of his child, 2-Samuel 12:22; or rather to some sore affliction upon himself; since it follows,
(e) "non aperiam", Pagninus, Montanus, Piscator, Gejerus; so Ainsworth.