“External knowledge of Christ is found to be only a false and dangerous make-believe, however eloquently and freely lip servants may talk about the gospel. The gospel is not a doctrine of the tongue, but of life. . . The philosophers rightly condemn and banish with disgrace from their company those who profess to know the art of life, but who are in reality vain babblers. With much better reason Christians ought to detest those who have the gospel on their lips, but not in their hearts.” (John Calvin Golden Booklet of the True Christian Life)