To understand a doctrine from the past correctly, it is necessary to set it within its proper historical and cultural context. The fundamental claim of historicism, however, is that the truth of a philosophy is determined on the basis of its appropriateness to a certain period and a certain historical purpose. At least implicitly, therefore, the enduring validity of truth is denied. What was true in one period, historicists claim, may not be true in another. Thus for them the history of thought becomes little more than an archeological resource useful for illustrating positions once held, but for the most part outmoded and meaningless now. On the contrary, it should not be forgotten that, even if a formulation is bound in some way by time and culture, the truth or the error which it expresses can invariably be identified and evaluated as such despite the distance of space and time. (Papal Encyclical, Fides et Ratio, 14 September 1998).
There is also a certain historicism, which attributing value only to the events of man's life, overthrows the foundation of all truth and absolute law both on the level of philosophical speculations and especially to Christian dogmas. (Papal Encyclical, Humani Generis, 12 August 1950).