Ghost, who will seldom tolerate error. He is promised to the teaching Church for the safe guidance of the faithful; these declarations are, however, the ordinary doctrinal utterances of that ecclesiastical office. And the Holy Ghost cannot permit that the teaching authority should by a wrong decision forfeit the confidence it enjoys. Moreover, this authority ranks very high even when looked at from a purely human standpoint. Those who are invested with it are mostly men of great learning, competent to give such doctrinal decisions by virtue of their experience and position, and learned advisers are at their side. They are guided by the tradition and wisdom of a universal Church, which measures its history by thousands of years: the decisions, too, are for the most part but the application or repetition of previous doctrinal utterances. Besides, there is the hesitating caution which advances to a decision only after long deliberations, and in undemonstrated matters usually refrains from decision; a caution which has increased still more in recent times, since so many subtle questions have arisen on the boundaries of science and faith. It is also known that many inquisitive eyes are constantly turned on Rome, and a single wrong decision might entail most disagreeable consequences for friend and foe. The pressure must be very great before a much-disputed question is taken up at all. Of course it is by no means impossible that difficulties may pile up in such a way that an error may really be made. History knows of such a case. But the very fact that the one case of _Galileo_ is always quoted, and, therefore, that in the long history of the Congregations this is considered to be almost the only case of importance, is a proof how carefully the Congregations proceed, and that supernatural aid is granted them. An institution which in the course of its long existence had to reply to innumerable questions and against which only one wrong decision of importance can be pointed out, must necessarily be an exemplary institution. An institution so free from human error must surely be guided by the Holy Ghost. Compare with this the many cases in which science has had to correct itself, had to abandon its long-championed propositions as untenable.