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42 though every revealed truth is definite and precise, nevertheless, all are not defined. The need of definition arises when any revealed truth has been obscured or denied. The general history of the Church will therefore give the general history of the Faith; but the history of Councils will give chiefly, if not only, the history of those parts of revelation which have been assailed by heresy and protected by definition.

The Divine Tradition of the Church contains truths of the supernatural order which without revelation could not have been known to man, such as the Incarnation of God and the mystery of the Holy Trinity, and truths of the natural order which are known also by reason, such as the existence of God. The circumference of this Divine Tradition is far wider than the range of definitions. The Church guards, teaches, and transmits the whole divine tradition of natural and supernatural truth, but defines only those parts of the deposit which have been obscured or denied.

The eighteen Œcumenical Councils of the Church have therefore defined such specific doctrines of the Faith as were contested. The Council of the Vatican has, for this reason, treated of two primary truths greatly contested but never hitherto defined: namely, the Supernatural order and the Church. It is this which will fix the character of the Vatican Council, and will mark in history the progress of error in the Christian world at this day.

The series of heresy has followed the order of the Baptismal Creed. It began by assailing the nature and unity of God the Creator; then of the Redeemer;