Throughout this chapter, James warns against the wisdom of the world. This includes the pursuit of success at all costs and the pursuit of self-interest. As human beings, we must recognize our own arrogance of thinking that we are in charge of our own lives. In order to escape the desperate pursuit of cash, power, and pleasure, it is important to realize how dependent and fragile we are.
Despite the fact that James is not condemning prudent planning or prayerful preparations for the future, he is certainly warning against making presumptuous plans that disregard God's guidance, deny His gracious providence, and stray outside of His will for our lives, which is very foolish and will almost certainly result in calamity in the future. The human being is not an autonomous, self-governing creature. 
As His children, we must be very careful to follow His will every day and be sure to include Him in our preparations and plans rather than make arrogant and prideful decisions without involving Him. As Christians, let us never forget that we cannot remain still in our Christian journey unless we fully surrender to God.

Dear Heavenly Father, I am fully aware that my life is fragile and that my time on earth is short compared to eternity. I pray that You will help me to live my life from an eternal perspective, knowing that You have control over my life and that You know what tomorrow holds. Allow me to fully submit myself to Jesus, to humble myself before Him, to seek His face, and to be guided by the Holy Spirit.
In Jesus's name I pray. Amen.