It is clearly a vital duty of Christians to stand apart from false teachers who deny the fundamentals of the faith. Many scriptures make this plain. But what about so-called ‘secondary separation’, meaning separation from believers who continue to walk closely with heretics and wrongdoers? And what about preachers who curse, or promote extreme worldliness, yet who claim to be saved? Here is guidance through a minefield of problems today, with help on the use of love, charity and discretion in applying the doctrine of separation.