See Video link: http://youtu.be/d57hAF6K77w
From the 2010 Shepherd's Conference; Phil Johnson gives a sermon illustrating how we are in a Spiritual War.
2 Corinthians 10:4,5
"For the weapons of our warfare are not of the flesh, but divinely powerful for the destruction of fortresses. We are destroying speculations and every lofty thing raised up against the knowledge of God, and we are talking every thought captive to the obedience of Christ, "