Do not boast about tomorrow, For you do not know what a day may bring forth.
Proverbs 27:1

The phrase, “Do not boast” isn’t referring to “bragging about the day after today.” The boasting the Proverbs is referring to is an indirect boasting in oneself. The one who boasts about tomorrow, is pridefully boasting about what he or she will do tomorrow, or that he or she knows what tomorrow will bring.

The proverb warns against [forbids!] doing either. Why? For [or because] you do not know what a day may bring forth. In other words, since you do not know the future, do not pretend or insist that you do.

This injunction does not forbid planning for the future. Many Proverbs speak of the fool as one who does not plan for tomorrow by acting responsibly today. Planning is not bad. Having a savings account is not sinful. Purchasing a reasonable amount of insurance is not a lack of faith. All three are examples of acting responsibly today “For [or because] you do not know what tomorrow may bring forth”!

Make plans, but write them in pencil—preferably a pencil with a good eraser on the other end. Why? To be responsible without boasting that you know the future.

By the way, though we do not know the future, praise God that as Christians, we know and are loved by the One who not only does know the future—He ordains and controls it!