*Minor differences ignored. Grouped by changes, with first version listed as example.
Teach us so to number our days. Some translate to the number of our days, which gives the same sense. As Moses perceived that what he had hitherto taught is not comprehended by the understandings of men until God shine upon them by his Spirit, he now sets himself to prayer. It indeed seems at first sight absurd to pray that we may know the number of our years. What? since even the strongest scarcely reach the age of fourscore years, is there any difficulty in reckoning up so small a sum? Children learn numbers as soon as they begin to prattle; and we do not need a teacher in arithmetic to enable us to count the length of a hundred upon our fingers. So much the fouler and more shameful is our stupidity in never comprehending the short term of our life. Even he who is most skillful in arithmetic, and who can precisely and accurately understand and investigate millions of millions, is nevertheless unable to count fourscore years in his own life. It is surely a monstrous thing that men can measure all distances without themselves, that they know how many feet the moon is distant from the center of the earth, what space there is between the different planets; and, in short, that they can measure all the dimensions both of heaven and earth; while yet they cannot number threescore and ten years in their own case. It is therefore evident that Moses had good reason to beseech God for ability to perform what requires a wisdom which is very rare among mankind. The last clause of the verse is also worthy of special notice. By it he teaches us that we then truly apply our hearts to wisdom when we comprehend the shortness of human life. What can be a greater proof of madness than to ramble about without proposing to one's self any end? True believers alone, who know the difference between this transitory state and a blessed eternity, for which they were created, know what ought to be the aim of their life. No man then can regulate his life with a settled mind, but he who, knowing the end of it, that is to say death itself, is led to consider the great purpose of man's existence in this world, that he may aspire after the prize of the heavenly calling.
So teach us to number our days - literally, "To number our days make us know, and we will bring a heart of wisdom." The prayer is, that God would instruct us to estimate our days aright: their number; the rapidity with which they pass away; the liability to be cut down; the certainty that they must soon come to an end; their bearing on the future state of being.
That we may apply our hearts unto wisdom - Margin, "Cause to come." We will bring, or cause to come, a heart of wisdom. By taking a just account of life, that we may bring to it a heart truly wise, or act wisely in view of these facts. The prayer is, that God would enable us to form such an estimate of life, that we shall be truly wise; that we may be able to act "as if" we saw the whole of life, or as we should do if we saw its end. God sees the end - the time, the manner, the circumstances in which life will close; and although he has wisely hidden that from us, yet he can enable us to act as if we saw it for ourselves; to have the same objects before us, and to make as much of life, "as if" we saw when and how it would close. If anyone knew when, and where, and how he was to die, it might be presumed that this would exert an important influence on him in forming his plans, and on his general manner of life. The prayer is, that God would enable us to act "as if" we had such a view.
So teach us to number our days - Let us deeply consider our own frailty, and the shortness and uncertainty of life, that we may live for eternity, acquaint ourselves with thee and be at peace; that we may die in thy favor and live and reign with thee eternally.
So teach [us] to number our days, that we may apply [our] hearts unto (l) wisdom.
(l) Which is by considering the shortness of our life, and by meditating the heavenly joys.
So teach us to number our days,.... Not merely to count them, how many they are, in an arithmetical way; there is no need of divine teachings for that; some few instructions from an arithmetician, and a moderate skill in arithmetic, will enable persons not only to count the years of their lives, but even how many days they have lived: nor is this to be understood of calculating or reckoning of time to come; no man can count the number of days he has to live; the number of his days, months, and years, is with the Lord; but is hid from him: the living know they shall die; but know not how long they shall live, and when they shall die: this the Lord teaches not, nor should we be solicitous to know: but rather the meaning of the petition is, that God would teach us to number our days, as if the present one was the last; for we cannot boast of tomorrow; we know not but this day, or night, our souls may be required of us: but the sense is, that God would teach us seriously to meditate on, and consider of, the shortness of our days; that they are but as a shadow, and there is no abiding; and the vanity and sinfulness of them, that so we may not desire to live here always; and the troubles and sorrows of them, which may serve to wean us from the world, and to observe how unprofitably we have spent them; which may put us upon redeeming time, and also to take notice of the goodness of God, that has followed us all our days, which may lead us to repentance, and engage us in the fear of God:
that we may apply our hearts unto wisdom; to consider our latter end, and what will become of us hereafter; which is a branch of wisdom so to do; to seek the way of salvation by Christ; to seek to Christ, the wisdom of God, for it; to fear the Lord, which is the beginning of wisdom; and to walk circumspectly, not as fools, but as wise; to all which an application of the heart is necessary; for wisdom is to be sought for heartily, and with the whole heart: and to this divine teachings are requisite, as well as to number our days; for unless a man is taught of God, and by his Spirit convinced of sin, righteousness, and judgment, he will never be concerned, in good earnest, about a future state; nor inquire the way of salvation, nor heartily apply to Christ for it: he may number his days, and consider the shortness of them, and apply his heart to folly, and not wisdom; see Isaiah 22:21.
Those who would learn true wisdom, must pray for Divine instruction, must beg to be taught by the Holy Spirit; and for comfort and joy in the returns of God's favour. They pray for the mercy of God, for they pretend not to plead any merit of their own. His favour would be a full fountain of future joys. It would be a sufficient balance to former griefs. Let the grace of God in us produce the light of good works. And let Divine consolations put gladness into our hearts, and a lustre upon our countenances. The work of our hands, establish thou it; and, in order to that, establish us in it. Instead of wasting our precious, fleeting days in pursuing fancies, which leave the possessors for ever poor, let us seek the forgiveness of sins, and an inheritance in heaven. Let us pray that the work of the Holy Spirit may appear in converting our hearts, and that the beauty of holiness may be seen in our conduct.
This he prays we may know or understand, so as properly to number or appreciate the shortness of our days, that we may be wise.
Teach us - To consider the shortness of life, and the certainty and speediness of death. That - That we may heartily devote ourselves to true wisdom.
*More commentary available at chapter level.