2. An objection, however, is often made to the doctrine of infallibility _in limine_, which is too important not to be taken into consideration. It is urged that, as all religious knowledge rests on moral evidence, not on demonstration, our belief in the Church's infallibility must be of this character; but what can be more absurd than a probable infallibility, or a certainty resting on doubt?--I believe, because I am sure; and I am sure, because I suppose. Granting then that the gift of infallibility be adapted, when believed, to unite all intellects in one common confession, the fact that it is given is as difficult of proof as the developments which it is to prove, and nugatory therefore, and in consequence improbable in a Divine Scheme. The advocates of Rome, it has been urged, "insist on the necessity of an infallible guide in religious matters, as an argument that such a guide has really been accorded. Now it is obvious to inquire how individuals are to know with certainty that Rome _is_ infallible . . . how any ground can be such as to bring home to the mind infallibly that she is infallible; what conceivable proof amounts to more than a probability of the fact; and what advantage is an infallible guide, if those who are to be guided have, after all, no more than an opinion, as the Romanists call it, that she is infallible?"[81:1] 7. This argument, however, except when used, as is intended in this passage, against such persons as would remove all imperfection in the proof of Religion, is certainly a fallacious one. For since, as all allow, the Apostles were infallible, it tells against their infallibility, or the infallibility of Scripture, as truly as against the infallibility of the Church; for no one will say that the Apostles were made infallible for nothing, yet we are only morally certain that they were infallible. Further, if we have but probable grounds for the Church's infallibility, we have but the like for the impossibility of certain things, the necessity of others, the truth, the certainty of others; and therefore the words _infallibility_, _necessity_, _truth_, and _certainty_ ought all of them to be banished from the language. But why is it more inconsistent to speak of an uncertain infallibility than of a doubtful truth or a contingent necessity, phrases which present ideas clear and undeniable? In sooth we are playing with words when we use arguments of this sort. When we say that a person is infallible, we mean no more than that what he says is always true, always to be believed, always to be done. The term is resolvable into these phrases as its equivalents; either then the phrases are inadmissible, or the idea of infallibility must be allowed. A probable infallibility is a probable gift of never erring; a reception of the doctrine of a probable infallibility is faith and obedience towards a person founded on the probability of his never erring in his declarations or commands. What is