Introduction : why truth is worth fighting for -- Can truth survive in a postmodern society? -- Spiritual warfare : duty, danger, and guaranteed triumph -- Constrained into conflict : why we must fight for the faith -- Creeping apostasy : how false teachers sneak in -- Heresy's subtlety : why we must remain vigilant -- The evil of false teaching : how error turns grace into licentiousness -- The assault on divine authority : Christ's lordship denied -- How to survive in an age of apostasy : learning from the lessons of history -- Appendix : why discernment is out of fashion.