I will behave myself prudently in a perfect way David here shows that he carefully considered how weighty a charge was laid upon him when he was made king. We know, and it is a truth taught us by experience, that almost all kings are intoxicated with the splendors of royalty; and the proverb was not used without foundation in ancient times, "A king must be born either a king or a fool." It is indeed a mistake to say that kings are born fools. Men were led to speak in this manner, because it commonly happens that those who are invested with the government of kingdoms and empires are fools and blockheads. And surely it is a remarkable instance of the vengeance of God, that beasts, and such as are altogether unworthy to be numbered among men, commonly possess the highest authority. But although kings are not born fools, yet they are so blinded by their dignity, that they think themselves in no respect indebted to their subjects, become arrogant and haughty in their carriage, recklessly plunge into their pleasures, and at length utterly forget themselves. David therefore says, I will behave myself prudently, or, which amounts to the same thing, I will look warily to myself; it being a rare virtue for the man who may do as he pleases to exercise such moderation, as not to allow himself liberty in any degree to do evil. He then who is exalted to sovereign power, and yet, instead of attempting to go as far as he can in doing mischief, restrains himself by self-control, is endued with true understanding. In short, David protests that he will not be like other kings who are infatuated by their own dignity; but that according to the greatness of the charge imposed upon him, he would endeavor wisely to perform his duty. It is to be observed, that he represents wisdom as consisting in a perfect way, or in uprightness. From this we learn that tyrants who employ their talents in forming wicked devices, and who are daily contriving new methods for burdening and oppressing their subjects; in short, who are ingenious only in doing mischief, are not wise towards God. Many persons, it is true, dislike such craftiness; but still, it is undeniable that, if kings are intent upon enlarging the boundaries of their kingdom, and are masters in refined policy for accomplishing such a purpose, this is accounted the most perfect wisdom which they can possess, and is extolled to the skies. David, on the contrary, covets no other wisdom but that which is the mistress of integrity. Till thou comest to me These words may be read in two ways. Some translate them interrogatively, When wilt thou come? as if David besought God not to subject him to any longer delay. And truly he had just ground to groan and lament, when he saw himself so long oppressed with poverty, and driven from place to place a wretched exile. It had been better for him to have lived obscure and unnoticed in his father's cottage, following his former occupation as a shepherd, than to be anointed king, that, being driven out of his country, he might live in utter dishonor and hatred. But I prefer reading the sentence without interrogation, until or when thou comest; and yet even this I interpret somewhat differently from the majority of commentators, understanding it to mean, that although David still continued in the condition of a private person, and did not enjoy the royal power which had been promised him, he nevertheless did not cease in the meantime to follow after uprightness. Thus he sets the midst of his house in opposition to palaces and public buildings; as if he had said, Within my private house or in my family.

I will behave myself wisely - In the choice of principles to guide me; in my conduct in my family; in my official relations. This expresses a "desire" to act wisely, and a "purpose" to do it.
In a perfect way - In accordance with the perfect rules of right. I will make these my guide. I will "aim" to be perfect; I will have before me a perfect standard.
O when wilt thou come unto me? - Perhaps this would be better rendered, "When thou dost come unto me;" that is, When then dost visit me and my dwelling, thou shalt find that these are the principles which regulate and govern me in my house. The idea is that God would come to visit his habitation, and inspect his conduct; and that whenever this should occur, however often it might be, or however unexpectedly he might come, he should "always" find these principles governing him in his family. A man should so live that "whenever" God comes into his dwelling, or when anyone comes, or however narrow and searching may be the inspection, these principles shal be found to regulate his conduct.
I will walk within my house - Before my family; in the principles which shall govern me there.
With a perfect heart - Always aiming to do exactly that which is right: in my general conduct; in the rules by which I live; in my treatment of all under my charge and in my employ. The great principles of "right," in everything - in the smallest matters - shall guide and govern me.

I will behave myself wisely - God's law prescribes a perfect way of life; in this perfect way I have professed to walk, and I must act wisely in order to walk in it.
When wilt thou come unto me? - I can neither walk in this way, nor grow wise unto salvation, unless thou come unto me by thy grace and Spirit; for without thee I can do nothing.
I will walk within my house - It is easier for most men to walk with a perfect heart in the Church, or even in the world, than in their own families. How many are as meek as lambs among others, when at home they are wasps or tigers! The man who, in the midst of family provocations, maintains a Christian character, being meek, gentle, and long-suffering to his wife, his children, and his servants, has got a perfect heart, and adorns the doctrine of God his Savior in all things.
The original is very emphatic; אתהלך ethhallech, "I will set myself to walk," I will make it a determined point thus to walk. I will bear and forbear with children, servants, etc., not speaking rashly, nor giving way to bad tempers. Through various motives a man will behave with propriety and decorum among others; but none of these motives operate in his own house where he feels himself master, and consequently under no restraint.

I will behave myself wisely in a perfect way. (b) O when wilt thou come unto me? I will walk within my house with a perfect heart.
(b) Though as yet you deferred to place me in the kingly dignity, yet I will give myself to wisdom and uprightness being a private man.

I will behave myself wisely in a perfect way, So David did before he came to the throne, which made Saul fear him, and the people love him, 1-Samuel 18:14 and so he resolved to do, and did afterwards; and thus it becomes all good men, in every station of life, to do: and then do they behave wisely, when they walk circumspectly, not as fools, but as wise, redeeming the time; when they make the perfect law of liberty, the word of God, the rule of their faith; take Christ for their pattern and example, and the Spirit for their guide; when they walk as becomes the Gospel of Christ; seek the glory of God, and the good of others; behave inoffensively to all, and live as pilgrims and strangers here; attending closely to their duty, walking in all the commandments of the Lord blameless: and yet it is certain that no man lives without sin, or does or can behave himself wisely in so "perfect a way" and manner as to have no fault in him; wherefore this seems most applicable to Christ, who, as it was prophesied he should, so he did "deal prudently", or behave wisely, Isaiah 52:13, where the same word is used as here; and this is true of Christ throughout the whole of his life; in his infancy, when but twelve years of age; in his public ministry, in his conduct towards all men; in his answers to the ensnaring questions of his enemies; in his behaviour at his apprehension, arraignment, condemnation and crucifixion; and this to perfection, so as that the least fault could not be found in him:
O when wilt thou come unto me? and perform thy promise in bringing me to rule over all the tribes of Israel: or it may be read without an interrogation, "when thou wilt come unto me" (g); that is, when thou wilt grant me thy gracious presence, and divine assistance, then I will behave myself wisely, in a perfect way; or "in the way of perfect" (h) and upright men, and will walk with them, and do as they do; without the grace of God, and strength of Christ, and the assistance of the Spirit, nothing is to be done that is wise and good: if it is applied to Christ, it respects the time of his sufferings and death, when he was without the divine Presence and help:
I will walk within my house with a perfect heart; or "in the integrity of my heart" (i); in a sincere and upright manner, ruling my own house well, and setting a good example to all in the family; and so should all good men do, performing all duties of religion in the family; be a pattern of good works, bring up their children in the nurture and admonition of the Lord, and neglect nothing that may contribute to their real good and the glory of God: the house of Christ is his church and people: here he walks and manifests himself, giving proofs of his sincere love and affection to them: the Targum paraphrases it,
"the house of my doctrine;''
such is the church of Christ, Isaiah 2:3.
(g) So V. L. Musculus, Cocceius, Gejerus, Junius & Tremellius, Piscator, Tigurine version. (h) "in via integri"; so some in Michaelis. (i) "in integritate cordis mei", Tigurine version, Piscator, Cocceius, Gejerus.

In this Psalm the profession of the principles of his domestic and political government testifies, as well as actions in accordance with it, David's appreciation of God's mercy to him, and His judgment on his enemies: and thus he sings or celebrates God's dealings. (Psalm 101:1-8)
He avows his sincere purpose, by God's aid, to act uprightly (Genesis 17:1; Psalm 18:30).

I will - I will manage all my affairs with wisdom and integrity. When - God is often said in scripture to come to men, when he fulfills a promise to them. House - In my court and family, as well as in my public administrations.