Paul's warning is so important: not everything that claims to be Christian necessarily is what it says on the tin. Dangerous people are discerned by their character and their conduct, but what about those under threat? Just as a weak animal becomes prey when they drift out of the herd, so also we can become vulnerable if we are morally weak, emotionally unstable, spiritually fickle, and weighed down by unshakable anxieties. We live in a "survival of the fittest" society, but let's be different and care for one another in the body of Christ.