How do we do it?

I wondered a long time how to actually do the following God's way: 2 Corinthians 10:5: "We demolish arguments and every pretension that sets itself up against the knowledge of God,i and we take captive every thought to make it obedient to Christ."
How do you make thoughts obedient.. then the other day I was thinking, when those condemning thoughts show up in my head, I need to, out of obedience, reject those thoughts that are opposite of God's position on a matter.. God's position on me.. how He feels about me.. and I am not to receive those thoughts as true, but reject them immediately.. 

I like how the Life Application explains this verse:
" God must be the commander in chief—even our thoughts must be submitted to his control as we live for him. Spirit-empowered believers must capture every thought and yield it to Christ. When exposed to ideas or opportunities that might lead to wrong desires, you have a choice. You can recognize the danger and turn away, or you can allow unhealthy thoughts to take you captive. You capture your fantasies and desires when you honestly admit them to the Lord and ask him to redirect your thinking. Ask God to give you the spirit of discernment to keep your thoughts focused on his truth."