Now there was this cardinal distinction between Christianity and the religions and philosophies by which it was surrounded, nay even the Judaism of the day, that it referred all truth and revelation to one source, and that the Supreme and Only God. Pagan rites which honoured one or other out of ten thousand deities; philosophies which scarcely taught any source of revelation at all; Gnostic heresies which were based on Dualism, adored angels, or ascribed the two Testaments to distinct authors, could not regard truth as one, unalterable, consistent, imperative, and saving. But Christianity started with the principle that there was but "one God and one Mediator," and that He, "who at sundry times and in divers manners spake in time past unto the fathers by the Prophets, had in these last days spoken unto us by His Son." He had never left Himself without witness, and now He had come, not to undo the past, but to fulfil and perfect it. His Apostles, and they alone, possessed, venerated, and protected a Divine Message, as both sacred and sanctifying; and, in the collision and conflict of opinions, in ancient times or modern, it was that Message, and not any vague or antagonist teaching, that was to succeed in purifying, assimilating, transmuting, and taking into itself the many-coloured beliefs, forms of worship, codes of duty, schools of thought, through which it was ever moving. It was Grace, and it was Truth. § 1. _The Assimilating Power of Dogmatic Truth._ That there is a truth then; that there is one truth; that religious error is in itself of an immoral nature; that its maintainers, unless involuntarily such, are guilty in maintaining it; that it is to be dreaded; that the search for truth is not the gratification of curiosity; that its attainment has nothing of the excitement of a discovery; that the mind is below truth, not above it, and is bound, not to descant upon it, but to venerate it; that truth and falsehood are set before us for the trial of our hearts; that our choice is an awful giving forth of lots on which salvation or rejection is inscribed; that "before all things it is necessary to hold the Catholic faith;" that "he that would be saved must thus think," and not otherwise; that, "if thou criest after knowledge, and liftest up thy voice for understanding, if thou seekest her as silver, and searchest for her as for hid treasure, then shalt thou understand the fear of the Lord, and find the knowledge of God,"--this is the dogmatical principle, which has strength.