Pope Pius X
Pascendi Dominici Gregis §19
Pascendi Dominici Gregis: On the Doctrines of the Modernists
19 And thus, Venerable Brethren, the road is open for us to study the Modernists in the theological arena - a difficult task, yet one that may be disposed of briefly. The end to be attained is the conciliation of faith with science, always, however, saving the primacy of science over faith. In this branch the Modernist theologian avails himself of exactly the same principles which we have seen employed by the Modernist philosopher, and applies them to the believer: the principles of immanence and symbolism . The process is an extremely simple one. The philosopher has declared: The principle of faith is immanent ; the believer has added: This principle is God ; and the theologian draws the conclusion: God is immanent in man . Thus we have theological immanence . So too, the philosopher regards as certain that the representations of the object of faith are merely symbolical ; the believer has affirmed that the object of faith is God in Himself ; and the theologian proceeds to affirm that: The representations of the divine reality are symbolical . And thus we have theological symbolism . Truly enormous errors both, the pernicious character of which will be seen clearly from an examination of their consequences. For, to begin with symbolism , since symbols are but symbols in regard to their objects and only instruments in regard to the believer, it is necessary first of all, according to the teachings of the Modernists, that the believer do not lay too much stress on the formula, but avail himself of it only with the scope of uniting himself to the absolute truth which the formula at once reveals and conceals, that is to say, endeavours to express but without succeeding in doing so. They would also have the believer avail himself of the formulas only in as far as they are useful to him, for they are given to be a help and not a hindrance; with proper regard, however, for the social respect due to formulas which the public magisterium has deemed suitable for expressing the common consciousness until such time as the same magisterium provide otherwise. Concerning immanence it is not easy to determine what Modernists mean by it, for their own opinions on the subject vary. Some understand it in the sense that God working in man is more intimately present in him than man is in even himself, and this conception, if properly understood, is free from reproach. Others hold that the divine action is one with the action of nature, as the action of the first cause is one with the action of the secondary cause, and this would destroy the supernatural order. Others, finally, explain it in a way which savours of pantheism and this, in truth, is the sense which tallies best with the rest of their doctrines.
Source: Pascendi Dominici Gregis (Vatican.va)