Romans 12:2

And do not be conformed to the world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God.

Our minds can think and create thoughts that take us far from reality, which is why we have to keep them under control.  The word is a focus on God’s reality for our lives.  It is a positive force for us to overcome life’s obstacles and not be swallowed by them.  The renewing of the mind is the renewing of the focus to the perfect will of God.