Who knoweth the power of thine anger? even according to thy fear, _so is_ thy wrath. So teach _us_ to number our days, that we may apply _our_ hearts unto wisdom. Return, O LORD, how long? and let it repent thee concerning thy servants. O satisfy us early with thy mercy; that we may rejoice and be glad all our days. Make us glad according to the days _wherein_ thou hast afflicted us, _and_ the years _wherein_ we have seen evil. Let thy work appear unto thy servants, and thy glory unto their children. And let the beauty of the LORD our God be upon us: and establish thou the work of our hands upon us: yea, the work of our hands establish thou it. This Psalm contains a very great and important doctrine; in which Moses teaches what is the origin and cause of that death to which the whole human race is subject, and the reason why so horrible a punishment was inflicted on the whole race of mortals: the Psalmist saith, it was on account of sin: and the guilt and desert of sin are greater than can be conceived by the human mind, unless God touch the heart with a knowledge of it; and yet, in this sin and guilt, and under this wrath, all the sons of Adam are born. Moses here opens widely this punishment of sin, and this horrible misery; setting forth the proof of it in the shortness and uncertainty of human life; which life, in addition to this its shortness and uncertainty, is subject also to all kinds of calamity: and, in verse 11, Moses saith that this very unspeakable misery—death, and all other human calamities, as parts of that death, tend, or should lead us, to seek the grace and mercy of God, who alone can deliver us from all these evils,—sin, the slavery of the devil, and death. Hence all the calamities and afflictions of life, and even death itself, the punishment of sin, work together for good unto the elect, and unto those that fear God; that they may, by all things, be humbled, broken down, and crucified, and so, thirst after grace. “So teach us that we must die,” says Moses, “that we may become wise:” that is, that we may learn to know God and his will aright; for this is what Moses calls “becoming wise.” The wicked, and fools, who are not exercised with afflictions, who number not their days, nor think of death, nor meditate on the misery of life, but remain unexperienced and ignorant of all spiritual things, and are wrapped up in their own hypocrisy, never rightly know God, nor truly seek his help and mercy.