Charles H. Spurgeon on Psalms 119:4

Thou hast commanded us to keep thy precepts diligently. 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 travelling 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: he is now coming near home, and has already reached the first person plural, according to our version; we shall soon hear him crying out personally and for himself. 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.