Jesus does not talk about Satan much in the Gospel of John, but what he has to say is not flattering. The devil (and ruler of the world) is a murder, deceiver, and enemy of God's purposes (John 8:44). This sermon traces the thread of Satan's nature, tactics, and end from Genesis to Revelation. The spiritual battle continues today because we continue to live in a spiritual world where Satan, demons, and powers have influence. The task of the church is to know our Enemy (and it's not liberal politicians or agnostic neighbors) and his end.
This is the first in a 7-part series entitled Our Spiritual World.