5. Moreover, it must be borne in mind that, as the essence of all religion is authority and obedience, so the distinction between natural religion and revealed lies in this, that the one has a subjective authority, and the other an objective. Revelation consists in the manifestation of the Invisible Divine Power, or in the substitution of the voice of a Lawgiver for the voice of conscience. The supremacy of conscience is the essence of natural religion; the supremacy of Apostle, or Pope, or Church, or Bishop, is the essence of revealed; and when such external authority is taken away, the mind falls back again of necessity upon that inward guide which it possessed even before Revelation was vouchsafed. Thus, what conscience is in the system of nature, such is the voice of Scripture, or of the Church, or of the Holy See, as we may determine it, in the system of Revelation. It may be objected, indeed, that conscience is not infallible; it is true, but still it is ever to be obeyed. And this is just the prerogative which controversialists assign to the See of St. Peter; it is not in all cases infallible, it may err beyond its special province, but it has in all cases a claim on our obedience. "All Catholics and heretics," says Bellarmine, "agree in two things: first, that it is possible for the Pope, even as pope, and with his own assembly of councillors, or with General Council, to err in particular controversies of fact, which chiefly depend on human information and testimony; secondly, that it is possible for him to err as a private Doctor, even in universal questions of right, whether of faith or of morals, and that from ignorance, as sometimes happens to other doctors. Next, all Catholics agree in other two points, not, however, with heretics, but solely with each other: first, that the Pope with General Council cannot err, either in framing decrees of faith or general precepts of morality; secondly, that the Pope when determining anything in a doubtful matter, whether by himself or with his own particular Council, _whether it is possible for him to err or not, is to be obeyed_ by all the faithful."[87:1] And as obedience to conscience, even supposing conscience ill-informed, tends to the improvement of our moral nature, and ultimately of our knowledge, so obedience to our ecclesiastical superior may subserve our growth in illumination and sanctity, even though he should command what is extreme or inexpedient, or teach what is external to his legitimate province. 12.