Make marvellous thy mercies. As the word hphlh, haphleh, signifies sometimes to make wonderful, or remarkable, and sometimes to separate and set apart, both these senses will be very suitable to this passage. In Psalm 31:19, the "goodness" of God is said to be "laid up" in store as a peculiar treasure "for them that fear him," that he may bring it forth at the proper season, even when they are brought to an extremity, and when all things seem to be desperate. If, then, the translation, separate and set apart thy mercy, is preferred, the words are a prayer that God would display towards his servant David the special grace which he communicates to none but his chosen ones. While God involves both the good and the bad in danger indiscriminately, he at length shows, by the different issue of things, in regard to the two classes, that he does not confusedly mingle the chaff and the wheat together, seeing he gathers his own people into a company by themselves, (Matthew 3:12, and Matthew 25:32.) I, however, prefer following another exposition. David, in my judgment, perceiving that he could only be delivered from the perilous circumstances in which he was placed by singular and extraordinary means, betakes himself to the wonderful or miraculous power of God. Those who think he desires God to withhold his grace from his persecutors do too great violence to the scope of the passage. By this circumstance there is expressed the extreme danger to which David was exposed; for otherwise it would have been enough for him to have been succoured in the ordinary and common way in which God is accustomed daily to favor and to aid his own people. The grievousness of his distress, therefore, constrained him to beseech God to work miraculously for his deliverance. The title with which he here honors God, O thou preserver of those who trust [in thee,] serves to confirm him in the certain hope of obtaining his requests. As God takes upon him the charge of saving all who confide in him, David being one of their number, could upon good ground assure himself of safety and deliverance. Whenever, therefore, we approach God, let the first thought impressed on our minds be, that as he is not in vain called the preserver of those who trust in him, we have no reason whatever to be afraid of his not being ready to succor us, provided our faith continue firmly to rely upon his grace. And if every way of deliverance is shut up, let us also at the same time remember that he is possessed of wonderful and inconceivable means of succouring us, which serve so much the more conspicuously to magnify and manifest his power. But as the participle trusting, or hoping, is put without any additional word expressing the object of this trust or hope, [1] some interpreters connect it with the last words of the verse, thy right hand, as if the order of the words were inverted. They, therefore, resolve them thus, O thou preserver of those who trust in thy right hand, from those who rise up against them. As this, however, is harsh and strained, and the exposition which I have given is more natural, and more generally received, [2] let us follow it. To express, therefore, the meaning in one sentence, the Psalmist attributes to God the office of defending and preserving his own people from all the ungodly who rise up to assault them, and who, if it were in their power, would destroy them. And the ungodly are here said to exalt themselves against the hand of God, because, in molesting the faithful whom God has taken under his protection, they openly wage war against him. The doctrine contained in these words, namely, that when we are molested, an outrage is committed upon God in our person, is a very profitable one; for having once declared himself to be the guardian and protector of our welfare, whenever we are unjustly assailed, he puts forth his hand before us as a shield of defense. The two similitudes which David has subjoined in the following verse, respecting the apple of the eye, and the little birds which the mother keeps under her wings, are introduced for illustrating the same subject. God, to express the great care which he has of his own people, compares himself to a hen and other fowls, which spread out their wings to cherish and cover their young, and declares them to be no less dear to him than the apple of the eye, which is the tenderest part of the body, is to man; it follows, therefore, that whenever men rise up to molest and injure the righteous, war is waged against him. As this form of prayer was put into the mouth of David by the Holy Spirit, it is to be regarded as containing in it a promise. We have here presented to our contemplation a singular and an astonishing proof of the goodness of God, in humbling himself so far, and in a manner so to speak, transforming himself, in order to lift up our faith above the conceptions of the flesh.

Footnotes

1 - Poole observes, that the Hebrew phrase for "them which trust," might be properly rendered without any supplement, "believers."

2 - Calvin's rendering is the same as that of the Septuagint, Vulgate, and Syriac versions

Show thy marvelous loving-kindness - The literal translation of the original here would be, "distinguish thy favors." The Hebrew word used means properly "to separate; to distinguish;" then, "to make distinguished or great." The prayer is, that God would separate his mercies on this occasion from his ordinary mercies by the manifestation of greater powers, or by showing him special favor. The ordinary or common mercies which he was receiving at the hand of God would not meet the present case. His dangers were much greater than ordinary, his wants were more pressing than usual; and he asked for an interposition of mercy corresponding with his circumstances and condition. Such a prayer it is obviously proper to present before God; that is, it is right to ask him to suit his mercies to our special necessities; and when special dangers surround us, when we are assailed with especially strong temptations, when we have unusually arduous duties to perform, when we are pressed down with especially severe trials, it is right and proper to ask God to bestow favors upon us which will correspond with our special circumstances. His ability and his willingness to aid us are not measured by our ordinary requirements, but are equal to any of the necessities which can ever occur in our lives.
O thou that savest by thy right hand - Margin, "that savest those that trust in thee from those that rise up against thy right hand." The Hebrew will admit of either construction, though that in the text is the more correct. It is, literally, "Saving those trusting, from those that rise up, with thy right hand. The idea is, that it was a characteristic of God, or that it was what he usually did, to save by his own power those that trusted him from those who rose up against them. That is, God might be appealed to to do this now, on the ground that he was accustomed to do it; and that, so to speak, he would be acting "in character" in doing it. In other words, we may ask God to do what he is accustomed to do; we may go to him in reference to his well-known attributes and character, and ask him to act in a manner which will be but the regular and proper manifestation of his nature. We could not ask him to do what was contrary to his nature; we cannot ask him to act in a way which would be out of character. What he has always done for people, we may ask him to do for us; what is entirely consistent with his perfections, we may ask him to do in our own case.
By thy right hand - By thy power. The right hand is that by which we execute our purposes, or put forth our power; and the psalmist asks God to put forth his power in defending him. See Isaiah 41:10; Job 40:14; Psalm 89:13.
From those that rise up against them - From their enemies.

Show thy marvellous lovingkindness - David was now exposed to imminent danger; common interpositions of Providence could not save him; if God did not work miracles for him, he must fall by the hand of Saul. Yet he lays no claim to such miraculous interpositions; he expects all from God's lovingkindness.
The common reading here is הפלה חסדיך haphleh chasadeycha, "distinguish thy holy ones;" but הפלא haple, "do wonders," is the reading of about seventy MSS., some ancient editions, with the Septuagint, Vulgate, Chaldee, Syriac, and Arabic. The marginal reading of this verse is nearer the original than that of the text.

Shew thy marvellous lovingkindness, O thou that savest by thy right hand them which put their trust [in thee] from those that (g) rise up [against them].
(g) For all rebel against you, who trouble your Church.

Show thy marvellous loving kindness,.... Such is the lovingkindness of God to his people in Christ; which is sovereign, free, special, distinguishing, everlasting, and unchangeable; it is better than life, and passes knowledge; and which is set upon men and not angels, some and not all, and these many of them the worst and vilest of men, and all of them by nature children of wrath as others; and which has appeared in choosing them in Christ, putting them into his hand, and making a covenant with him for them; in sending him into the world to suffer and die for them; in regenerating, adopting, justifying, pardoning, and saving them with an everlasting salvation; all which is marvellous in their eyes, and will be the wonder of men and angels to all eternity: this sometimes is hidden from the objects of it, as it might be from the psalmist, and therefore he desires a manifestation of it to him; or else his sense is, that God would show to others in what a marvellous manner he loved him, by the help, deliverance, and salvation he would give him. Such a petition will agree with Christ; see Psalm 40:10. Some render the words (b), "separate thy lovingkindness", or cause it to pass "from them that rise up on" or "against thy right hand"; but these were never the objects of it; and there is no separation of them from it, nor of that from them who are interested in it, Romans 8:38; much better may it be rendered, "separate" or "distinguish thy lovingkindness" (c); that is, let it appear that I have special interest in thy lovingkindness, distinct from others; distinguish me by thy lovingkindness, remember me with that which thou bearest to a peculiar people, Psalm 106:4;
O thou that savest by thy right hand; either by his power, or by the man of his right hand, his own son;
them which put their trust in thee; not in men, not in an arm of flesh, not in themselves, in their own power, wisdom, riches, and righteousness; but in the Lord their God, who is the Saviour of all men, but especially of them that believe, 1-Timothy 4:10; for these he saves both in a temporal and in a spiritual manner;
from those that rise up against them; from all their spiritual enemies, sin and Satan; and from all outward ones, from the men of the world, oppressors and violent persecutors, who are afterwards described: the phrase, "by thy right hand", is by some, as Aben Ezra, connected with the word trust, and rendered, "them which trust in thy right hand" (d); either in the grace, mercy, and favour of God, dispensed by his right hand; or in his strength, and the mighty power of his arm; and by others it is joined to the last clause, and so it stands in the original text, and rendered, "from those that rise up against thy right hand" (e); and so the words describe such persons who in a bold and presumptuous manner set themselves against God, and strengthen themselves against the Almighty; who resist his counsel and will, oppose themselves to the Lord and his Anointed, the man of his right hand, made strong for himself; and to his saints, who are as dear to him as his right hand, and who are preserved by him in the hollow of his hand.
(b) Kimchi & Ben Melech. (c) "separa", Junius & Tremellius; "segrega", Montanus; so some in Vatablus; see Ainsworth. (d) "eos qui fidunt in dextera tua", so some in Vatablus, Castalio, Ainsworth; "recipentes se ad dexteram suam", Junius & Tremellius. (e) "ob insurgentes in dexteram tuam", Pagninus, Montanus, Cocceius; so Michaelis, Gejerus, Musculus.

Show--set apart as special and eminent (Exodus 8:18; Psalm 4:3).
thy right hand--for Thy power.

By - By thy great power.