Ubi Arcano Dei Consilio §42

⁴² Because the Church is by divine institution the sole depository and interpreter of the ideals and teachings of Christ, she alone possesses in any complete and true sense the power effectively to combat that materialistic philosophy which has already done and, still threatens, such tremendous harm to the home and to the state. The Church alone can introduce into society and maintain therein the prestige of a true, sound spiritualism, the spiritualism of Christianity which both from the point of view of truth and of its practical value is quite superior to any exclusively philosophical theory. The Church is the teacher and an example of world good-will, for she is able to inculcate and develop in mankind the "true spirit of brotherly love" (St. Augustine, De Moribus Ecclesiae Catholicae, i, 30) and by raising the public estimation of the value and dignity of the individual's soul help thereby to lift us even unto God.