Psalms 90:3

3 Thou shalt turn man to destruction. Moses, in the first place, mentions how frail and transitory is the life of man, and bewails its miseries. This he does, not for the purpose of quarrelling with God, but as an argument to induce him the more readily to exercise his mercy, even as he is elsewhere said to pardon mortal men, when he considers of what they are made, and remembers that they are but dust and grass, (Psalm 103:14.) he compares the course of our life to a ring or circle, because God, placing us upon the earth, turns us about within a narrow circuit, and when we have reached the last point, draws us back to himself in a moment. Others give a different interpretation, namely, that God leads men forth to death, and afterwards restores them at the resurrection. But this subtilty is far-fetched, and does not harmonise with the context. We have here laid down a simple definition of our life, that it is, as it were, a short revolution in which we quickly complete our circle, the last point of which is the termination of our earthly course. This account of human life sets in a clearer light the gracious manner in which God deals with his servants, in adopting them to be his peculiar people, that he may at length gather them together into his everlasting inheritance. Nor is it in vain that it is added, by way of contrast, (verse 4,) that a thousand years in God’s sight are as yesterday Although we are convinced from experience that men, when they have completed their circle, are forthwith taken out of the world, yet the knowledge of this frailty fails in making a deep impression upon our hearts, because we do not lift our eyes above the world. Whence proceeds the great stupidity of men, who, bound fast to the present state of existence, proceed in the affairs of life as if they were to live two thousand years, but because they do not elevate their conceptions above visible objects? Each man, when he compares himself with others, flatters himself that he will live to a great age. In short, men are so dull as to think that thirty years, or even a smaller number, are, as it were, an eternity; nor are they impressed with the brevity of their life so long as this world keeps possession of their thoughts. This is the reason why Moses awakens us by elevating our minds to the eternity of God, without the consideration of which we perceive not how speedily our life vanishes away. The imagination that we shall have a long life, resembles a profound sleep in which we are all benumbed, until meditation upon the heavenly life swallow up this foolish fancy respecting the length of our continuance upon earth.

As men are thus blinded, Moses sets before their view God as their judge. O Lord! as if he had said, if men would duly reflect upon that eternity from which thou beholdest these inconstant circlings of the world, they would not make so great account of the present life. But as, instead of seriously considering what is true duration, they rather wilfully turn away their eyes from heaven, this explains why they are so stupid, and look upon one day as if it were a hundred years. Moses’ apostrophe to God is emphatic, implying that his patience being exhausted at seeing us so thoughtless, he addresses himself to God; and that it was labor to no purpose for him to speak to the deaf, who would not be taught that they were mortal, no, not even by the proofs of this, which experience was constantly presenting before them. This text is quoted by the Apostle Peter in a sense somewhat different, (2 Peter 3:8,) while at the same time he does not pervert it, for he aptly and judiciously applies the testimony of Moses in illustration of the subject of which he is there treating. The design of Moses is to elevate the minds of men to heaven by withdrawing them from their own gross conceptions. And what is the object of Peter? As many, because Christ does not hasten his coming according to their desire, cast off the hope of the resurrection through the weariness of long delay, he corrects this preposterous impatience by a very suitable remedy. He perceives men’s faith in the Divine promises fainting and failing, from their thinking that Christ delays his coming too long. Whence does this proceed, but because they grovel upon the earth? Peter therefore appropriately applies these words of Moses to cure this vice. As the indulgence in pleasures to which unbelievers yield themselves is to be traced to this, that having their hearts too much set upon the world, they do not taste the pleasures of a celestial eternity; so impatience proceeds from the same source. Hence we learn the true use of this doctrine. To what is it owing that we have so great anxiety about our life, that nothing suffices us, and that we are continually molesting ourselves, but because we foolishly imagine that we shall nestle in this world for ever? Again, to what are we to ascribe that extreme fretfulness and impatience, which make our hearts fail in waiting for the coming of Christ, but to their grovelling upon the earth? Let us learn then not to judge according to the understanding of the flesh, but to depend upon the judgment of God; and let us elevate our minds by faith, even to his heavenly throne, from which he declares that this earthly life is nothing. Nor does Moses simply contrast a thousand years with one day, but he contrasts them with yesterday, which is already gone; for whatever is still before our eyes has a hold upon our minds, but we are less affected with the recollection of what is past. In regard to the word watch, the ancients, as is well known, were accustomed to divide the night into four watches, consisting of three hours each. To express still more forcibly how inconsiderable that which appears to us a long period is in God’s eyes, this similitude is added, That a thousand years in his sight differ nothing from three hours of the night, in which men scarcely know whether they are awake or asleep.