You have ordained Your precepts, That we should keep them diligently.
NASB95
You have commanded your precepts to be kept diligently.
ESV
Thou hast commanded us to keep thy precepts diligently.
KJV

We have seen the character of the Man of God. Let us mark the authority of God, commanding him to a diligent obedience. The very sight of the command is enough for him. He obeys for the command's sake, however contrary it may be to his own will. But has he any reason to complain of the yoke? Even under the dispensation, which "genders unto bondage" most encouraging were the obligations to obedience, "that it may be well with them, and with their children forever." Much more, then, we, under a dispensation of love, can never lack a motive for obedience! Let the daily mercies of Providence stir up the question, "What shall I render to the Lord?" Let the far richer mercies of grace produce "a living sacrifice" to be "presented to the Lord." Let "the love of Christ constrain us." Let the recollection of the "price with which we were bought," remind us of the Lord's ownership in us, and of our obligations to "glorify Him in our body, and in our spirit, which are His." Let us only "behold the Lamb of God;" let us hear His wrestling supplications, His deserted cry, His expiring agonies—the price of our redemption; and then let us ask ourselves—Can we lack a motive?

But what is the scriptural character of evangelical obedience? It is the work of the Spirit, enabling us to "obey the truth." It is the end of the purpose of God, who "has chosen us in Christ before the foundation of the world, that we should be holy and without blame before Him in love." It is the only satisfactory test of our profession.

Then let me begin my morning with the inquiry, "Lord, what will You have me to do?" "Teach me Your way, O Lord; I will walk in Your truth; unite my heart to fear Your name." Let me trade with all my talents for You: ever watchful, that I may be employed in Your work; setting a guard upon my thoughts, my lips, my tempers, my pursuits, that nothing may hinder, but rather everything may help me, in keeping Your precepts diligently.

But why do I ever find the precepts to be "grievous" to me? Is it not that some indolence is indulged; or some "iniquity regarded in my heart;" or some principle of unfaithfulness divides my services with two masters, when I ought to be "following the Lord fully?" Oh! for the spirit of "simplicity and godly sincerity" in the precepts of God. Oh! for that warm and constant love, which is the main-spring of devoted diligence in the service of God. Oh! for a larger supply of that "wisdom which is from above," and which is "without partiality and without hypocrisy!"

So that when we have done all, we are unprofitable servants, we have done only that which it was our duty to have done, seeing we have our Lord's command for it. God's precepts require careful obedience: there is no keeping them by accident. Some give to God a careless service, a sort of hit-or-miss obedience; but the Lord has not commanded such service, nor will he accept it. His law demands the love of all our heart, soul, mind, and strength; and a careless religion has none of these. We are also called to zealous obedience. We are to keep the precepts abundantly: the vessels of obedience should be filled to the brim, and the command carried out to the full of its meaning. As a man diligent in business arouses himself to do as much trade as he can, so must we be eager to serve the Lord as much as possible. Nor must we spare pains to do so, for a diligent obedience will also be laborious and self-denying. Those who are diligent in business rise up early and sit up late, and deny themselves much of comfort and repose. They are not soon tired, or, if they are, they persevere even with aching brow and weary eye. So should we serve the Lord. Such a Master deserves diligent servants; such service he demands, and will be content with nothing less. How seldom do men render it! and hence many through their negligence miss the double blessing spoken of in this psalm.

Some are diligent in superstition and will worship; be it ours to be diligent in keeping God's precepts. It is of no use traveling fast if we are not in the right road. Men have been diligent in a losing business, and the more they have traded the more they have lost: this is bad enough in commerce, we cannot afford to have it so in our religion.

God has not commanded us to be diligent in making precepts, but in keeping them. Some bind yokes upon their own necks, and make bonds and rules for others: but the wise course is to be satisfied with the rules of holy Scripture, and to strive to keep them all, in all places, towards all men, and in all respects. If we do not this, we may become eminent in our own religion, but we shall not have kept the command of God, nor shall we be accepted of him.

The Psalmist began with the third person: "Blessed are the undefiled." He is now coming near home, and has already reached the first person plural, according to our version: "You have commanded us." We shall soon hear him crying out personally and for himself: "O that my ways were directed!" As the heart glows with love to holiness, we long to have a personal interest in it. The word of God is a heart-affecting book, and when we begin to sing its praises it soon comes home to us, and sets us praying to be ourselves conformed to its teachings. Would not the reader do well to pause here, and by devout meditation impress his own heart with the divine authority of the Scriptures, that so he may devote himself personally to the careful, prayerful, constant, punctual, and cheerful keeping of the precepts of the Lord?