Ephesians 3:16

That He would grant you, according to the riches of His glory, to be strengthened with might through His Spirit in the inner man.

God has the power to strengthen our Spirit in the inner man.  The more we feed our spirit and renew our mind to the word of God the stronger we become.  We all need this strength on a daily basis to make decisions and function in our families and work.  The inner man will rule and reign in this life when we let Jesus flow through us freely.