Demons, Deliverance, Discernment - Separating Fact from Fiction about the Spirit World

Satan and his fellow fallen angels hate God and hate us, and they exert their considerable powers and intelligence to try and lead us to damnation. Ordinarily they do this through temptation to sin, but sometimes their attacks are more severe, taking the form of demonic oppression and even possession.
What are these evil spirits we call demons? How can we recognize when and how they are influencing us? And most importantly, how do we fight back?
In Demons, Deliverance, and Discernment, Fr. Mi...