Great as are the services of language in enabling us to extend the compass of our inferences, to test their validity, and to communicate them to others, still the mind itself is more versatile and vigorous than any of its works, of which language is one, and it is only under its penetrating and subtle action that the margin disappears, which I have described as intervening between verbal argumentation and conclusions in the concrete. It determines what science cannot determine, the limit of converging probabilities and the reasons sufficient for a proof. It is the ratiocinative mind itself, and no trick of art, however simple in its form and sure in operation, by which we are able to determine that a moving body left to itself will never stop, and that no man can live without eating. Nor, again, is it by any diagram that we are able to scrutinize, sort, and combine the many premisses which must be first run together before we answer duly a given question. It is to the living mind that we must look for the means of using correctly principles of whatever kind, facts or doctrines, experiences or testimonies, true or probable, and of discerning what conclusion from these is necessary, suitable, or expedient, when they are taken for granted; and this, either by means of a natural gift, or from mental formation and practice and a long familiarity with those various starting-points. Thus, when Laud said that he did not see his way to come to terms with the Holy See, “till Rome was other than she was,” no Catholic would admit the sentiment: but any Catholic may understand that this is just the judgment consistent with Laud’s actual condition of thought and cast of opinions, his ecclesiastical position, and the existing state of England. Nor, lastly, is an action of the mind itself less necessary in relation to those first elements of thought which in all reasoning are assumptions, the principles, tastes, and opinions, very often of a personal character, which are half the battle in the inference with which the reasoning is to terminate. It is the mind itself that detects them in their obscure recesses, illustrates them, establishes them, eliminates them, resolves them into simpler ideas, as the case may be. The mind contemplates them without the use of words, by a process which cannot be analyzed. Thus it was that Bacon separated the physical system of the world from the theological; thus that Butler connected together the moral system with the religious. Logical formulas could never have sustained the reasonings involved in such investigations.