In a court of law, we understand that stating part of the truth can be a clever way of deceiving others, why is why the witness must promise to speak the truth, the whole truth and nothing but the truth. Every error that comes into the church and causes so much damage begins as a part-truth and ends up being a full-blown deception. In this article, our colleagues at Reformation Scotland helpfully show why being committed to the whole counsel of God as defined in a confession of faith guards against this danger.