The craving for an infallible guide arises from men's consciousness of the weakness of their understanding. In temporal matters we are constrained to act on our own judgment. When we have important decisions to make we often feel ourselves in great doubt and perplexity, and some times the decision we ultimately make turns out to be wrong, and we have to pay the penalty in loss or other suffering. A loss, however, affecting only our temporal interests may be borne; but it seems intolerable to men that, when their eternal interests are at stake, any doubt or uncertainty should attend their decisions, and they look out for some guide who may be able to tell them, with infallible certainty, which is the right way. And yet it is easy to show that it is in the nature of things impossible to give men absolute security against error in any other way than by their being them selves made infallible; and I shall hereafter show you that when men profess faith in the Church's infallibility, they are, in real truth, professing faith in their own.