In James 4, there are some new themes being introduced as well as the repetition of various ideas the author has already addressed. As a side note, any time the Bible repeats something, our ears should perk up. James does this often and by the end of the book we have a fairly strong grasp on the key takeaways from these 5 chapters. James 4:14 states "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. " This is an important concept because the acknowledgement of life's brevity impacts how we live and our character that follows. Much of this chapter once again addresses matters of conduct. It is clear who we are in Christ is different than who we once were before meeting Him.