Create in me a clean heart, O God! In the previous part of the psalm David has been praying for pardon. He now requests that the grace of the Spirit, which he had forfeited, or deserved to have forfeited, might be restored to him. The two requests are quite distinct, though sometimes confounded together, even by men of learning. He passes from the subject of the gratuitous remission of sin to that of sanctification. And to this he was naturally led with earnest anxiety, by the consciousness of his having merited the loss of all the gifts of the Spirit, and of his having actually, in a great measure, lost them. By employing the term create, he expresses his persuasion that nothing less than a miracle could effect his reformation, and emphatically declares that repentance is the gift of God. The Sophists grant the necessity of the aids of the Spirit, and allow that assisting grace must both go before and come after; but by assigning a middle place to the free will of man, they rob God of a great part of his glory. David, by the word which he here uses, describes the work of God in renewing the heart in a manner suitable to its extraordinary nature, representing it as the formation of a new creature. As he had already been endued with the Spirit, he prays in the latter part of the verse that God would renew a right spirit within him But by the term create, which he had previously employed, he acknowledges that we are indebted entirely to the grace of God, both for our first regeneration, and, in the event of our falling, for subsequent restoration. He does not merely assert that his heart and spirit were weak, requiring divine assistance, but that they must remain destitute of all purity and rectitude till these be communicated from above. By this it appears that our nature is entirely corrupt: for were it possessed of any rectitude or purity, David would not, as in this verse, have called the one a gift of the Spirit, and the other a creation. In the verse which follows, he presents the same petition, in language which implies the connection of pardon with the enjoyment of the leading of the Holy Spirit. If God reconcile us gratuitously to himself, it follows that he will guide us by the Spirit of adoption. It is only such as he loves, and has numbered among his own children, that he blesses with a share of his Spirit; and David shows that he was sensible of this when he prays for the continuance of the grace of adoption as indispensable to the continued possession of the Spirit. The words of this verse imply that the Spirit had not altogether been taken away from him, however much his gifts had been temporarily obscured. Indeed, it is evident that he could not be altogether divested of his former excellencies, for he seems to have discharged his duties as a king with credit, to have conscientiously observed the ordinances of religion, and to have regulated his conduct by the divine law. Upon one point he had fallen into a deadly lethargy, but he was not given over to a reprobate mind;" and it is scarcely conceivable that the rebuke of Nathan the prophet should have operated so easily and so suddenly in arousing him, had there been no latent spark of godliness still remaining in his soul. He prays, it is true, that his spirit may be renewed, but this must be understood with a limitation. The truth on which we are now insisting is an important one, as many learned men have been inconsiderately drawn into the opinion that the elect, by falling into mortal sin, may lose the Spirit altogether, and be alienated from God. The contrary is clearly declared by Peter, who tells us that the word by which we are born again is an incorruptible seed, (1-Peter 1:23;) and John is equally explicit in informing us that the elect are preserved from falling away altogether, (1 John 3:9.) However much they may appear for a time to have been cast off by God, it is afterwards seen that grace must have been alive in their breast, even during that interval when it seemed to be extinct. Nor is there any force in the objection that David speaks as if he feared that he might be deprived of the Spirit. It is natural that the saints, when they have fallen into sin, and have thus done what they could to expel the grace of God, should feel an anxiety upon this point; but it is their duty to hold fast the truth that grace is the incorruptible seed of God, which never can perish in any heart where it has been deposited. This is the spirit displayed by David. Reflecting upon his offense, he is agitated with fears, and yet rests in the persuasion that, being a child of God, he would not be deprived of what indeed he had justly forfeited.

Create in me a clean heart, O God - The word rendered "create," ברא berâ' - is a word which is properly employed to denote an act of "creation;" that is, of causing something to exist where there was nothing before. It is the word which is used in Genesis 1:1 : "In the beginning God "created" the heaven and the earth," and which is commonly used to express the act of creation. It is used "here" evidently in the sense of causing that to exist which did not exist before; and there is clearly a recognition of the divine "power," or a feeling on the part of David that this could be done by God alone. The idea is, however, not that a new "substance" might be brought into being to which the name "a clean heart" might be given, but that he might "have" a clean heart; that his heart might be made pure; that his affections and feelings might be made right; that he might have what he was conscious that he did "not" now possess - a clean or a pure heart. This, he felt, could be produced only by the power of God; and the passage, therefore, proves that it is a doctrine of the Old Testament, as it is of the New, that the human heart is changed only by a divine agency.
And renew a right spirit within me - Margin, "a constant spirit." The Hebrew word - נכון nākûn - means properly, that which is "erect," or that which is made to stand up, or which is firm or established. It is used to denote
(a) that which is upright, right, proper: Exodus 8:26; Job 42:8; Psalm 5:9;
(b) that which is right, true, sincere, Psalm 78:37;
(c) that which is firm, constant, fixed.
This would seem to be the meaning here. He prays for a heart that would be firm in the purposes of virtue; that would not yield to temptation; that would carry out holy resolutions; that would be stedfast in the service of God. The word "renew" here means to be or to make new; to produce something new. It is also used in the sense of making anew, as applied to buildings or cities in the sense of "rebuilding" or "repairing" them: Isaiah 61:4; 2-Chronicles 15:8; 2-Chronicles 24:4. The word here would naturally convey the idea that there had been formerly a right and proper spirit in him, which he prayed might now be restored. The language is that of one who had done right formerly, but who had fallen into sin, and who desired that he might be brought back into his former condition.

Create in me a clean heart - Mending will not avail; my heart is altogether corrupted; it must be new made, made as it was in the beginning. This is exactly the sentiment of St. Paul: Neither circumcision availeth any thing, nor uncircumcision, but a new creation; and the salvation given under the Gospel dispensation is called a being created anew in Christ Jesus.
A right spirit within me - רוח נכון ruach nachon, a constant, steady, determined spirit; called Psalm 51:12, רוח נדיבה ruach nedibah, a noble spirit. a free, generous, princely spirit; cheerfully giving up itself to thee; no longer bound and degraded by the sinfulness of sin.

(i) Create in me a clean heart, O God; and renew a right spirit within me.
(i) He confesses that when God's Spirit is cold in us, to have it again revived, is as a new creation.

Create in me a clean heart, O God,.... Which was now defiled with sin, and of which being convinced, he was led more and more to see the impurity of his heart and nature, from which all his evil actions flowed; and being sensible that he could not make his heart clean himself, and that this was the work of God, and a work which required creating power, he entreats it of him: for as the first work of conversion is no other than a creation, or a production of something new, which was not before; so the restoring of a backslider, as it goes by the same name, it requires the same power; and as the implantation of grace at first, and particularly of faith, is a work of almighty power; so the same power must be put forth to bring it into exercise, after falls into sin; that it may afresh deal with the heart purifying blood of Christ, which only can make it clean, and is what is here meant;
and renew a right spirit within me; by which is designed, not the Holy Spirit of God (k); for he is the renewer; nor the spirit or soul of man as to its essence; but with respect to the qualities of it; and here it signifies a renewing of the inward man, or an increase of grace, and causing it to abound in act and exercise; and intends a spirit of uprightness and integrity, in opposition to dissimulation and hypocrisy; a spirit "prepared and ready" (l) to every good work, Matthew 26:41; "one firm" (m) and unmoved from obedience to the Lord, by sin, temptations, and snares; a heart fixed, trusting in the Lord, and comfortably assured of an interest in pardoning grace and mercy.
(k) Vid. Zohar in Genesis. fol. 107. 3. (l) "paratum seu promptum", Gejerus, Michaelis; so Ainsworth. (m) "Firmua", Junius & Tremellius, Piscator, Cocceius.

Create--a work of almighty power.
in me--literally, "to me," or, "for me"; bestow as a gift, a heart free from taint of sin (Psalm 24:4; Psalm 73:1).
renew--implies that he had possessed it; the essential principle of a new nature had not been lost, but its influence interrupted (Luke 22:32); for Psalm 51:11 shows that he had not lost God's presence and Spirit (1-Samuel 16:13), though he had lost the "joy of his salvation" (Psalm 51:12), for whose return he prays.
right spirit--literally, "constant," "firm," not yielding to temptation.

In the second part, the prayer for justification is followed by the prayer for renewing. A clean heart that is not beclouded by sin and a consciousness of sin (for לב includes the conscience, Psychology, S. 134; tr. p. 160); a stedfast spirit (נכון, cf. Psalm 78:37; Psalm 112:7) is a spirit certain respecting his state of favour and well-grounded in it. David's prayer has reference to the very same thing that is promised by the prophets as a future work of salvation wrought by God the Redeemer on His people (Jeremiah 24:7; Ezekiel 11:19; Ezekiel 36:26); it has reference to those spiritual facts of experience which, it is true, could be experienced even under the Old Testament relatively and anticipatively, but to the actual realization of which the New Testament history, fulfilling ancient prophecy has first of all produced effectual and comprehensive grounds and motives, viz., μετάνοια (לב = νοῦς), καινὴ κτίσις, παλιγγενεσία καὶ ἀνακαὶνωσις πνεῦματος (Titus 3:5). David, without distinguishing between them, thinks of himself as king, as Israelite, and as man. Consequently we are not at liberty to say that רוּח הקּדשׁ (as in Isaiah 63:16), πνεῦμα ἁγιωσύνης = ἅγιον, is here the Spirit of grace in distinction from the Spirit of office. If Jahve should reject David as He rejected Saul, this would be the extreme manifestation of anger (2-Kings 24:20) towards him as king and as a man at the same time. The Holy Spirit is none other than that which came upon him by means of the anointing, 1-Samuel 16:13. This Spirit, by sin, he has grieved and forfeited. Hence he prays God to show favour rather than execute His right, and not to take this His Holy Spirit from him.

Create - Work in me an holy frame of heart, whereby my inward filth may be purged away. Right - Hebrews. firm or constant, that my resolution may be fixed and unmoveable. Spirit - Temper or disposition of soul.