withstand in the evil day, and having done all, to stand.”
If we see the devil as defeated then we will not fight, we will stand. If we see ourselves as earthly then we will behave in an earthly manner: our words, our thoughts, our prayers, our deeds, our warfare will be carried out in an earthly manner. If we see ourselves seated with Christ in the heavenlies then we will behave in a heavenly manner, as a heavenly people, bringing the Mind and Will and Kingdom of God to bear upon that which is contrary to Christ on the earth.
How do we obtain heavenly vision? We must ask to see as He sees. We must pray that God will illuminate our heart. Our vision affects our actions.