I am also reading The Discipline of Spiritual Discernment, the new book by Tim Challies, blogger non-pareil out of Oakville Ont.
On page 129 I came across this paragraph and the words virtually lept off the page,
John writes, 'Beloved, do not believe every spirit, but test the spirits to see whether they are from God, for many false prophets have gone out into the world' (1 John 4:1) Just one verse earlier, in John 3:24, John has spoken of the fact that the Holy Spirit is given to us as evidence of God's presence in our lives. And having spoken of the Spirit, John now ensures that his readers know that not every spirit is holy. We are tempted to believe and obey spirits, for they represent a spiritual realm that is outside our experience, but many spirits are commanded by Satan, the father of lies... (emphasis mine, JK)
I'll say no more.