According to St. Thomas, also, the unity, and consequently the catholicity of the Church, is radically grounded in faith. The angelic doctor means here living faith, or _fides formata_. According to this view, the principle of catholicity pervades the innermost depth of subjectivity. At the same time it is clear how the same comes to an historical manifestation. This takes place in the symbol of the Church. The faith which finds its historical expression in the ecclesiastical symbol is to be regarded as _fides formata_, [Footnote 24] for this reason, because it is a confession of faith made in the name and by the personality of the collective Church, which possesses its inward principle of unity in the _fides formata_, or living faith. Moreover, the symbol of the Church is a constant warning for those of her members who have not the grace of sanctification to make their faith living through charity. [Footnote 25] [Footnote 24: That is, faith made perfect by charity as it exists in a person who is in the state of grace, in contradistinction from the faith of a sinner.--TRANSLATOR ] [Footnote 25: _Secunda Secundae_, qu. 1. a. q. ad 3. ] In the foregoing doctrinal exposition St. Thomas has marked out for us the path to be followed in seeking {101} for the medium of union between the exterior and ulterior catholicity of the Church. Our argument must start, therefore, from the position that the unity of the Church in the first line is a unity in faith. In this notion we have the speculative middle term between the inner being of the Church and her historical form of manifestation. From the blending of both these elements is formed the full, adequate idea of catholicity. This last exhibits itself as a force acting in two distinct spheres, that of the inward subjectivity and that of historical objectivity. Consequently, the exterior and interior catholicity of the Church, or the two sides of Catholicism, must be reduced to the same principle. A further evolution of this thought will make it clear, why the being of the true Church can only find its true actualization in the historical form of Catholicism.