39. The necessity of the moment urged the Council to set forth a wider and broader exposition of the creed including many intricate questions, because the heresy which Photinus was reviving was sapping our Catholic home by many secret mines. Their purpose was to oppose every form of stealthy subtle heresy by a corresponding form of pure and unsullied faith, and to have as many complete explanations of the faith as there were instances of peculiar faithlessness. Immediately after the universal and unquestioned statement of the Christian mysteries, the explanation of the faith against the heretics begins as follows.