"My words are Spirit and Life, and not to be weighed by the understanding of man. They are not to be drawn forth for vain approbation, but to be heard in silence, and to be received with all humility and great affection."
Thomas à Kempis

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"The Lord gave the word:
great was the company of
those that published it."
Psalm 68:11

For the word of God is quick and powerful,... This is to be understood of Christ, the essential Word of God; for the Word of God was a known name of the Messiah among the Jews; and therefore the apostle makes use of it when writing to them: and the words are introduced as a reason why care should be taken, that men fall not off from the Gospel, because Christ, the author, sum, and substance of it, is the living God, omnipotent and omniscient; for not a thing, but a person is spoken of, who is a Judge, and a critical discerner of the secrets of men's hearts: and certain it is, that this Word is spoken of as a person, and is said to be a priest in the following verses; to which may be added, that the several things said of the Word exactly agree with Christ: he is "the Word of God"; as the word is the birth of the mind, he is the only begotten of the Father; he is the Word that spoke for the elect in the council and covenant of grace, and that spoke all things out of nothing in creation; he is the Word that has been promised, and spoken of by the prophets from the beginning of the world; and is the interpreter of his Father's mind, and our Advocate with the Father: he is

quick, or, as it may be better rendered, "living"; he has life in himself as God, he is the living God; he is the living Redeemer and Mediator, and he lives for ever as man; he is the author and giver of life, natural, spiritual, and eternal: and he is powerful, as he appears to be in the creation and sustaining of all things; in his miracles and ministrations; in the work of man's redemption; in the preservation of his people, and in his advocacy and intercession:

and sharper than any twoedged sword; or "more cutting than one", by the words of his mouth, by the power of his Spirit, and the efficacy of his grace; for his mouth itself is as a sharp sword, and out of it comes forth one, Isa_49:2 by which he pierces the hearts of men, cuts them to the quick, and lays them open. Jehovah is called a twoedged sword with the Jews; and Philo the Jew speaks of the flaming sword of the Logos.

Piercing even to the dividing asunder soul and spirit, and of the joints and marrow; the like property Philo the Jew ascribes to the "Logos", or Word; he calls him, "a cutter", and says he cuts and divides all things, even all sensible things, yea, atoms, and things indivisible; the apostle seems here to have respect to the several names with which the soul of man is called by the Jews, "soul, spirit, and breath"; the latter of these, they say, dwells between the other two. Some by the soul understand the natural and unregenerate part in man, and by the spirit the renewed and regenerate part, which though sometimes are not so easily distinguished by men, yet they are by Christ; others think the soul designs the inferior faculties, the affections; and the spirit the superior ones, the mind and understanding; but the apostle's meaning seems to be this, that whereas the soul and spirit are invisible, and the joints and marrow are covered and hid; so sharp and quick sighted, and so penetrating is the divine Word, that it reaches the most secret and hidden things of men: and this sense is confirmed by what follows,

and is a discerner of the thoughts and intents of the heart; Christ knows what is in man; he is the searcher of the hearts, and the trier of the reins of the children of men; and this will be more apparent at the last day, when he will make manifest the counsels of the heart, and will critically inquire, and accurately judge of them.

— John Gill's Exposition of the Entire Bible

For the word of God - The design of this and the following verse is obvious. It is to show that we cannot escape the notice of God; that all insincerity, unbelief, hypocrisy, will be detected by him; and that since our hearts are perfectly open before him, we should be sincere and should not attempt to deceive him. The sense is, that the truth of God is all-penetrating and searching, and that the real thoughts and intents of the heart will be brought to light, and that if there is insincerity and self-deception there can be no hope of escape. There has been a great variety of opinion here about the meaning of the phrase "the Word of God." Some have supposed that it means the Lord Jesus; others, the whole of the divine revelation; others the gospel; others the particular threatening referred to here. The "Word of God" is "what God speaks" - whether it be a promise or a threatening; whether it be Law or gospel; whether it be a simple declaration or a statement of a doctrine. The idea here is, that what "God had said" is suited to detect hypocrisy and to lay open the true nature of the feelings of the soul, so that there can be no escape for the guilty. His "truth" is adapted to bring out the real feelings, and to show man exactly what he is. Truth always has this power - whether preached, or read, or communicated by conversation, or impressed upon the memory and conscience by the Holy Spirit. There can be no escape from the penetrating, searching application of the Word of God. That truth has power to show what man is, and is like a penetrating sword that lays open the whole man; compare Isa_49:2. The phrase "the Word of God" here may be applied, therefore, to the "truth" of God, however made known to the mind. In some way it will bring out the real feelings, and show what man is.

Is quick - Greek zon - "living." It is not dead, inert, and powerless. It has a "living" power, and is energetic and active. It is "adapted" to produce this effect.

And powerful - Mighty. Its power is seen in awakening the conscience; alarming the fears; laying bare the secret feelings of the heart, and causing the sinner to tremble with the apprehension of the coming judgment. All the great changes in the moral world for the better, have been caused by the power of truth. They are such as the truth in its own nature is suited to effect, and if we may judge of its power by the greatness of the revolutions produced, no words can over-estimate the might of the truth which God has revealed.

Sharper than any two-edged sword - Literally, "two-mouthed" sword - distomon. The word "mouth" was given to the sword because it seemed to "devour" all before it. It consumed or destroyed as a wild beast does. The comparison of the Word of God to a sword or to an arrow, is designed to show its power of penetrating the heart; Ecc_12:11, "The words of the wise are as goads, and as nails fastened by the masters of assemblies;" compare Isa_49:2. "And he hath made my mouth like a sharp sword;" Rev_1:16, "And out of his mouth went a sharp two-edged sword;" Rev_2:12, Rev_2:16; Rev_19:15. The comparison is common in the classics, and in Arabic poetry; see Gesenius, on Isa_49:2. The idea is that of piercing, or penetrating; and the meaning here is, that the Word of God reaches the "heart" - the very center of action, and lays open the motives and feelings of the man. It was common among the ancients to have a sword with two edges. The Roman sword was commonly made in this manner. The fact that it had two edges made it more easy to penetrate, as well as to cut with every way.

Piercing even to the dividing asunder - Penetrating so as to divide.

Soul and spirit - The animal life from the immortal soul. The former word here - psuche? - "soul" - is evidently used to denote the "animal life," as distinguished from the mind or soul. The latter word - pneuma - "spirit" - means the soul; the immaterial and immortal part; what lives when the animal life is extinct. This distinction occurs in 1Th_5:23, "your whole spirit, and soul, and body;" and it is a distinction which we are constantly in the habit of making. There is the body in man - the animal life - and the immortal part that leaves the body when life is extinct. Mysteriously united, they constitute one man. When the animal life is separated from the soul, or when the soul leaves the animated body, the body dies, and life is extinct. To separate the one from the other is, therefore, the same as to take life - and this is the idea here, that the Word of God is like a sharp sword that inflicts deadly wounds. The sinner "dies;" that is, he becomes dead to his former hopes, or is "slain" by the Law; Rom_7:9, "I was alive without the law once, but when the commandment came, sin revived, and I died." This is the power referred to here - the power of destroying the hopes of the sinner; cutting him down under conviction; and prostrating him as if a sword had pierced his heart.

And of the joints and marrow - The figure is still continued of the sword that takes life. Such a sword would seem to penetrate even the joints and marrow of the body. It would separate the joints, and pierce through the very bones to the marrow. A similar effect, Paul says, is produced by truth. It seems to penetrate the very essence of the soul, and lay it all open to the view.

And is a discerner of the thoughts - It shows what the thoughts and intentions are. Prof. Stuart, Bloomfield, and some others, suppose that the reference here is to "God" speaking by his word. But the more natural construction certainly is, to refer it to the Word or truth of God. It is true that God searches the heart, and knows the thoughts, but that is not the truth which is prominent here. It is, that the thoughts and intents of the heart are brought out to view by the Word of God. And can anyone doubt this? see Rom_7:7. Is it not true that people are made to see their real character under the exhibition of the truth of God? That in the light of the Law they see their past lives to be sinful? That the exhibition of truth calls to their recollection many long-forgotten sins? And that their real feelings are brought out when the truth of God is proclaimed? Men then are made to look upon their motives as they had never done before, and to see in their hearts feelings whose existence they would not have suspected if it had not been for the exhibition of the truth. The exhibition of the truth is like pouring down the beams of the sun at midnight on a dark world; and the truth lays open the real feelings of the sinner as that sun would disclose the clouds of wickedness that are now performed under cover of the night. Many a man has a deep and fixed hostility to God and to his gospel who might never be sensible of it if the truth was not faithfully proclaimed. The particular idea here is, that the truth of God will detect the feelings of the hypocrite and self-deceiver. They cannot always conceal their emotions, and the time will come when truth, like light poured into the soul, will reveal their unbelief and their secret sins. They who are cherishing a hope of salvation, therefore, should be on their guard lest they mistake the name for the reality. Let us learn from this verse:

(1) The power of truth. It is "suited" to lay open the secret feelings of the soul. There is not an effect produced in awakening a sinner; or in his conviction, conversion, and sanctification, which the truth is not "adapted" to produce. The truth of God is not dead; nor suited to make people "worse;" nor designed merely to show its own "weakness," and to be a mere occasion on which the Holy Spirit acts on the mind; it is in its own nature Fitted to produce just the effects which are produced when it awakens, convicts, converts, and sanctifies the soul.

(2) the truth should be preached with the feeling that it is adapted to this end. Men who preach should endeavor to understand the nature of the mind and of the moral feelings, as really as he who would inflict a deadly wound should endeavor to understand enough about anatomy to know where the heart is, or he who administers medicine should endeavor to know what is adapted to remove certain diseases. And he who has no belief in the efficacy of truth to produce any effect, resembles one who should suppose that all knowledge of the human system was needless to him who wished to perform a surgical operation, and who should cut at random - piously leaving it with God to direct the knife; or he who should go into a hospital of patients and administer medicines indiscriminately - devoutly saying that all healing must come from God, and that the use of medicine was only to show its own weakness! Thus, many men seem to preach. Yet for aught that appears, truth is just as wisely adapted to save the soul as medicine is to heal the sick; and why then should not a preacher be as careful to study the nature of truth and its adaptedness to a particular end, as a student of the healing art is to understand the adaptedness of medicine to cure disease? The true way of preaching is, to feel that truth is adapted to the end in view; to select what is best suited for that end; to preach as if the whole result depended on getting that truth before the mind and into the heart - and then to leave the whole result with God - as a physician with right feelings will exert all his skill to save his patient, and then commit the whole question of life and health to God. He will be more likely to praise God intelligently who believes that he has wisely adapted a plan to the end in view, than he who believes that God works only at random.

Albert Barnes' Notes on the Bible