The theory of the ideal church is not yet effectively refuted, when we on the Catholic side content ourselves with proving that the true Church must become visible. This general proposition does not exclude the proposition of our opponents. For, according to the Protestant doctrine, also, the creative power of the spirit of Christianity exhibits itself in the construction of visible congregations, and the gradual actualization of the ideal Church is conditioned by a sensibly apprehensible mediation. The final decision of this question must therefore be sought in the demonstration of the proposition that the inmost being of the Church can only realize itself historically in the one specific form; that a catholicity of the essence of the Church without a catholicity in her manifestation is entirely inconceivable. Only by this demonstration will the retreat of Protestant polemics into the ideal Church be for ever cut off. Some have argued against the Protestant view, that as Christian truth is one so the visible Church can also be but one. [Footnote 34] The argument is valid only in the prior supposition that there can be but a single form of historical manifestation for the inner being of the Church. This, however, Protestantism denies in the sense, that from its stand-point every particular church represents the idea of the Church, [Footnote 35] even though it may be on one side only. According to the diversified stages of cultivation in the Christian people, so they say, now one, now another side of Christian truth attains to its expression in the particular confessions, but in none the full and entire truth. The contradiction existing between these, therefore, in nowise falls back upon the Christian verity itself. This Protestant evasion can also be alone met in the way above designated, by establishing the relation between the essence and the manifestation of Catholicism. [Footnote 34: Moehler, "Symbolism."]