18 But although these words of our predecessor leave no room for doubt or dispute, it grieves us to find that not only men outside, but even children of the Catholic Church - nay, what is a peculiar sorrow to us, even clerics and professors of sacred learning - who in their own conceit either openly repudiate or at least attack in secret the Church's teaching on this point. We warmly commend, of course, those who, with the assistance of critical methods, seek to discover new ways of explaining the difficulties in Holy Scripture, whether for their own guidance or to help others. But we remind them that they will only come to miserable grief if they neglect our predecessor's injunctions and overstep the limits set by the Fathers.
Source: Spiritus Paraclitus (Vatican.va)