What the Bible says about Fanaticism
(From Forerunner Commentary)

Isaiah 47:8-9 Self-indulgence promotes, among other things, attitudes of fanaticism, false security, presumption, and fun-seeking. Fanaticism is unbridled obsession, and though most do not recognize it as form of self-indulgence, it is a gratification of selfish desire. The apostle Paul says that we should avoid those who are driven by lust and greed and have no self-control. Martin G. Collins Overcoming (Part 8): Self-Indulgence Related Topics: False Security | Greed | Lust | Presumption | Self Control | Self Gratification | Self Indulgence | Selfish Desire | Selfishness