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Rh Jesus Christ, 'necessity lieth upon us, and woe unto us if we preach not the gospel.' It may, however, be said that many revealed truths are not defined; and that it does not follow that any doctrine ought to be defined, only because it is true.

2. This is indeed certain, but a further reason for defining it is easy to find. This revealed truth has been denied. There are two reasons for which the Church from the beginning has defined the doctrines of faith: the one, to make them clear, definite, and precise; the other, to reaffirm, and to defend them, when they have been called in question. If the infallibility of the visible Head of the Church had never been denied, it might not have been necessary to define it now. The true doctrine of justification was never defined till it was denied. The nature of inspiration has never yet been defined, but the denial which is now widespread may one day demand it. In like manner the infallibility of the Roman Pontiff has been denied. Its definition therefore becomes necessary. We affirm that it was never formally denied before the period of the Council of Constance, and that this modern denial of the truth renders its definition necessary. We are told by objectors that the denial is far more ancient and widespread: that only makes the definition all the more necessary. They who, to make the doctrine appear doubtful, or to prove it to be false, represent the denial of it to be ancient and widespread, in that proportion increase the necessity of declaring it by a dogmatic decree. Such a denial as emanated from the so-called Assembly of the French