"Do not boast about tomorrow,
for you do not know what a day may bring forth."
- Proverbs 27:1
The design of the wise man in this book of Proverbs is to give us the precepts of true wisdom, or to teach us how to conduct ourselves wisely in the course of our lives. Wisdom very much consists in making a wise improvement of time and of the opportunities we enjoy. He advises us here to a wise improvement of the present time.
The precept given is not to boast of tomorrow. That is, not to speak or act as though it were our own. It is absurd for men to boast of that which is not theirs. The wise man would not have us behave ourselves as though any time were ours but the present.
The reason given for this precept is, for you do not know what a day may bring forth. We have no hold of future time; we know not whether we shall see the morrow; or if we do know that we shall see it, we know not what we shall see when it arrives. We ought to carry ourselves as though we knew we should not live another day and improve the current one as if it were the last. In particular, we should live every day as conscientiously and in as holy a manner as if we knew it were the last. We should be as careful to avoid all sin as if we knew that this night our souls should be required of us. We should be as careful to do every duty which God requires of us, and take as much care that we have a good account to give to our Judge of our improvement of that day, as if we concluded that we must be called to give an account before another day arrives.
Yet in many other respects, we are not to behave ourselves as though we concluded that we should not live another day. For instance, in such a case it would not be the duty of any person to make provision for his temporal subsistence. It would never be man’s duty to plow or sow the field, or to lay up for winter. But these things are man’s duty: “Go to the ant, you sluggard. Consider her ways and be wise, which, having no guide, overseer, or ruler, provides her supplies in the summer, and gathers her food in the harvest.”
On the other hand, if we were certain that we should not live another day, some things would be our duty today which now are not so. For instance, it would be proper for us to spend our time in giving our dying counsels, in setting our houses in order, in doing those things which immediately concern our departure. Therefore, the words that forbid us to boast of tomorrow cannot be extended to signify that we ought in all respects live as if we knew we should not see another day. Yet they undoubtedly mean that we ought not to behave ourselves as though we depended on another day.
Those who act as if they had another day set their hearts on the enjoyments of this life. I do not mean that we cannot have some affection for the enjoyments of this world; otherwise they would cease to be enjoyments. If we might have no degree of rejoicing in them, we would not be thankful for them. Persons may in a degree take delight in earthly friends and other earthly enjoyments. It is agreeable to the wise man’s advice that we should do so: “It is good and fitting for one to eat and drink and to enjoy the good of all his labor in which he toils under the sun." But when we set our hearts on these things, place our happiness in them, turn and fix our inclinations so much upon them that we cannot enjoy ourselves without them, we show that we have our dependence on another day.
When people are distressed with the loss of any temporal enjoyments, it shows that they set their hearts upon them. If they are very much distressed and the comfort of their lives destroyed by the loss, it shows that those temporal enjoyments were too much the foundation on which their comfort stood. That which makes a building totter and threatens its destruction is not the removal of some of the exterior parts of the superstructure, but the removal of some considerable part of the foundation on which the house stands.
I shall ask you now to examine yourselves and see whether you do not boast of tomorrow. Do you not set your hearts much more on this world than you would if you had no dependence on another day? Is not the language of the rich man in the gospel the secret language of your hearts? “Soul, you have much goods laid up for many years.” If you did not depend on having considerably more time in this world, would you spend so much time asking, "What shall we eat, and what shall we drink, and wherewithal shall we be clothed?" Would you not rather ask, "How shall we make our calling and election sure?" Would so much of your time be spent in laying up treasure on earth and so little in laying up treasure in heaven, were it not that you put death at a distance?
God has concealed from us the day of our death partly for this end, that we might be excited to be always ready, and might live as those that are always waiting for the coming of their Lord. Now therefore let me, in Christ’s name, renew the call and counsel of Jesus Christ to you: Watch as those that know not what hour their Lord will come. Let me call upon you who are this day in an unsaved condition. Do not depend upon another day; that you will not be in hell before tomorrow morning. You have no reason for any such dependence.