This need of an authoritative sanction is increased by considering, after M. Guizot's suggestion, that Christianity, though represented in prophecy as a kingdom, came into the world as an idea rather than an institution, and has had to wrap itself in clothing and fit itself with armour of its own providing, and to form the instruments and methods of its prosperity and warfare. If the developments, which have above been called moral, are to take place to any great extent, and without them it is difficult to see how Christianity can exist at all, if only its relations towards civil government have to be ascertained, or the qualifications for the profession of it have to be defined, surely an authority is necessary to impart decision to what is vague, and confidence to what is empirical, to ratify the successive steps of so elaborate a process, and to secure the validity of inferences which are to be made the premisses of more remote investigations.
Tests, it is true, for ascertaining the correctness of developments in general may be drawn out, as I shall show in the sequel; but they are insufficient for the guidance of individuals in the case of so large and complicated a problem as Christianity, though they may aid our inquiries and support our conclusions in particular points. They are of a scientific and controversial, not of a practical character, and are instruments rather than warrants of right decisions. Moreover, they rather serve as answers to objections brought against the actual decisions of authority, than are proofs of the correctness of those decisions. While, then, on the one hand, it is probable that some means will be granted for ascertaining the legitimate and true developments of Revelation, it appears, on the other, that these means must of necessity be external to the developments themselves.
4.
Reasons shall be given in this Section for concluding that, in proportion to the probability of true developments of doctrine and practice in the Divine Scheme, so is the probability also of the appointment in that scheme of an external authority to decide upon them, thereby separating them from the mass of mere human speculation, extravagance, corruption, and error, in and out of which they grow. This is the doctrine of the infallibility of the Church; for by infallibility I suppose is meant the power of deciding whether this, that, and a third, and any number of theological or ethical statements are true.
5.
1. Let the state of the case be carefully considered. If the Christian doctrine, as originally taught, admits of true and important developments, as was argued in the foregoing Section, this is a strong antecedent argument in favour of a provision in the Dispensation for putting a seal of authority upon those developments. The probability of their being known to be true varies with that of their truth. The two ideas indeed are quite distinct, I grant, of revealing and of guaranteeing a truth, and they are often distinct in fact. There are various revelations all over the earth which do not carry with them the evidence of their divinity. Such are the inward suggestions and secret illuminations granted to so many individuals; such are the traditionary doctrines which are found among the heathen, that "vague and unconnected family of religious truths, originally from God, but sojourning, without the sanction of miracle or a definite home, as pilgrims up and down the world, and discernible and separable from the corrupt legends with which they are mixed, by the spiritual mind alone."[79:1] There is nothing impossible in the notion of a revelation occurring without evidences that it is a revelation; just as human sciences are a divine gift, yet are reached by our ordinary powers and have no claim on our faith. But Christianity is not of this nature: it is a revelation which comes to us as a revelation, as a whole, objectively, and with a profession of infallibility; and the only question to be determined relates to the matter of the revelation. If then there are certain great truths, or duties, or observances, naturally and legitimately resulting from the doctrines originally professed, it is but reasonable to include these true results in the idea of the revelation itself, to consider them parts of it, and if the revelation be not only true, but guaranteed as true, to anticipate that they too will come under the privilege of that guarantee. Christianity, unlike other revelations of God's will, except the Jewish, of which it is a continuation, is an objective religion, or a revelation with credentials; it is natural, I say, to view it wholly as such, and not partly sui generis, partly like others. Such as it begins, such let it be considered to continue; granting that certain large developments of it are true, they must surely be accredited as true.
6.
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 inconsistent in this idea? Whatever then be the particular means of determining infallibility, the abstract objection may be put aside.[81:2]