"Ye know not"

There is one lawgiver, who is able to save and to destroy: who art thou that judgest another? Go to now, ye that say, Today or tomorrow we will go into such a city, and continue there a year, and buy and sell, and get gain: Whereas ye know not what shall be on the morrow. For what is your life? It is even a vapour, that appeareth for a little time, and then vanisheth away. For that ye ought to say, If the Lord will, we shall live, and do this, or that. James 4:12-15 KJV