Charles H. Spurgeon on Psalms 90:12

To number our days, is not simply to take the reckoning and admeasurement of human life. This has been done already in Holy Scripture, where it is said, "The days of our years are threescore years and ten; and if by reason of strength they be fourscore years, yet is their strength labour and sorrow; for it is soon cut off, and we fly away." Nor yet is it, in the world's phrase, to calculate the chances of survivorship, which any man may do in the instance of the aggregate, but which no man can do in the case of the individual. But it is to take the measure of our days as compared with the work to be performed, with the provision to be laid up for eternity, with the preparation to be made for death, with the precaution to be taken against judgment. It is to estimate human life by the purposes to which it should be applied, by the eternity to which it must conduct, and in which it shall at last be absorbed. Under this aspect it is, that David contemplates man when he says, "Thou hast made our days as an handbreadth; and mine age is as nothing before thee", Ps 39:5; and then proceeds to include in this comprehensive estimate even those whose days have been the longest upon earth: "Verily, every man at his best estate is altogether vanity." —Thomas Dale, 1847.