17 Now in all this it is not difficult to recognize one of the many forms of the eternal war waged against divine truth, and one that is all the more dangerous from the fact that its weapons are craftily concealed with a covering of fictitious piety, ingenuous candor, and earnestness, in the hands of factious men who use them to reconcile things that are absolutely irreconcilable, viz., the extravagances of a fickle human science with divine faith, and the spirit of a frivolous world with the dignity and constancy of the Church.
Source: Communium Rerum (Vatican.va)