"Evolutionary theories stress the continuity of development between the species from the lower to the higher, as well as a sufficient duration to permit the operation of natural or artificial causes according to the laws governing these. Catholic teaching stresses an essential discontinuity in the case of those essences, whose limits were fixed by the Creator and which cannot be modified by the intervention of natural or artificial agents of a finite power. [The Church] has never pretended in any instance of observable species, on the basis of revelation, to know what those limits are. But that there are such limits, even at the level of inanimate existence, sound science as well as philosophy has tended to confirm." 6
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