James 4:13

To-day or to-morrow, &c. An admonition against that presumption, when persons forget the uncertainty of life, and the vanity of all things in this world, which vanish like a vapour, and can never be relied upon, so as to count upon years and the time to come. All things here appear and disappear in a moment. Take heed, therefore, not to glory or boast in your arrogancies; (ver. 16.) literally, pride; like the rich man, (Luke x.) who thought of nothing but a long and merry life, and was cut off that very night. And being now admonished, reflect that it is sinful to know what is good, what is your duty, and not to comply with it. (Witham)