From Pope St. John Paul II’s encyclical Fides et Ratio (1984):
This insistence on the need for a close relationship of continuity between contemporary philosophy and the philosophy developed in the Christian tradition is intended to avert the danger which lies hidden in some currents of thought which are especially prevalent today. It is appropriate, I think, to review them, however briefly, in order to point out their errors and the consequent risks for philosophical work.
The first goes by the name of eclecticism, by which is meant the approach of those who, in research, teaching and argumentation, even in theology, tend to use individual ideas drawn from different philosophies, without concern for their internal coherence, their place within a system or their historical context. They therefore run the risk of being unable to distinguish the part of truth of a given doctrine from elements of it which may be erroneous or ill-suited to the task at hand. An extreme form of eclecticism appears also in the rhetorical misuse of philosophical terms to which some theologians are given at times. Such manipulation does not help the search for truth and does not train reason—whether theological or philosophical—to formulate arguments seriously and scientifically. The rigorous and far-reaching study of philosophical doctrines, their particular terminology and the context in which they arose, helps to overcome the danger of eclecticism and makes it possible to integrate them into theological discourse in a way appropriate to the task.
— Fides et Ratio 86