Charles H. Spurgeon on Psalms 90:12

Teach us to number our days. The proverbial oracles of our parsimonious ancestors have informed us that the fatal waste of fortune is by small expenses, by the profusion of sums too little singly to alarm our caution, and which we never suffer ourselves to consider together. Of the same kind is prodigality of life: he that hopes to look back hereafter with satisfaction upon past years, must learn to know the present value of single minutes, and endeavour to let no particle of time fall useless to the ground. An Italian philosopher expressed in his motto that time was his estate; an estate, indeed, that will produce nothing without cultivation, but will always abundantly repay the labours of industry, and satisfy the most extensive desires, if no part of it be suffered to lie waste by negligence, to be overrun by noxious plants, or laid out for show rather than for use. —Samuel Johnson.