James
James 4:14ESV·traditional attribution

yet you do not know what tomorrow will bring. What is your life? For you are a mist that appears for a little time and then vanishes.

John Calvin Reformed @genevareformer

14 For what is your life? He might have checked this foolish license in determining things to come by many other reasons; for we see how the Lord daily frustrates those presumptuous men who promise what great things they will do. But he was satisfied with this one argument, who has promised to thee a life for tomorrow?

Matthew Henry Presbyterian @wholebiblehenry

In this part of the chapter, I. We are cautioned against the sin of evil-speaking: Speak not evil one of another, brethren, Jam 4:11. The Greek word, katalaleite, signifies speaking any thing that may hurt or injure another; we must not speak evil things of others, though they be true, unless we be called to it, and there be some necessary occasion for the; much...

Commenting on James 4:11-17

John Gill Reformed Baptist @doctorgill

Whereas ye know not what shall be on the morrow,.... Whether there would be a morrow for them or not, whether they should live till tomorrow; and if they should, they knew not what a morrow would bring forth, or what things would happen, which might prevent their intended journey and success: no man can secure a day, an hour, a moment, and much less...