Logic is the organization of thought, and, as being such, is a security for the faithfulness of intellectual developments; and the necessity of using it is undeniable as far as this, that its rules must not be transgressed. That it is not brought into exercise in every instance of doctrinal development is owing to the varieties of mental constitution, whether in communities or in individuals, with whom great truths or seeming truths are lodged. The question indeed may be asked whether a development can be other in any case than a logical operation; but, if by this is meant a conscious reasoning from premisses to conclusion, of course the answer must be in the negative. An idea under one or other of its aspects grows in the mind by remaining there; it becomes familiar and distinct, and is viewed in its relations; it leads to other aspects, and these again to others, subtle, recondite, original, according to the character, intellectual and moral, of the recipient; and thus a body of thought is gradually formed without his recognizing what is going on within him. And all this while, or at least from time to time, external circumstances elicit into formal statement the thoughts which are coming into being in the depths of his mind; and soon he has to begin to defend them; and then again a further process must take place, of analyzing his statements and ascertaining their dependence one on another. And thus he is led to regard as consequences, and to trace to principles, what hitherto he has discerned by a moral perception, and adopted on sympathy; and logic is brought in to arrange and inculcate what no science was employed in gaining. And so in the same way, such intellectual processes, as are carried on silently and spontaneously in the mind of a party or school, of necessity come to light at a later date, and are recognized, and their issues are scientifically arranged. And then logic has the further function of propagation; analogy, the nature of the case, antecedent probability, application of principles, congruity, expedience, being some of the methods of proof by which the development is continued from mind to mind and established in the faith of the community. Yet even then the analysis is not made on a principle, or with any view to its whole course and finished results. Each argument is brought for an immediate purpose; minds develope step by step, without looking behind them or anticipating their goal, and without either intention or promise of forming a system. Afterwards, however, this logical character which the whole wears becomes a test that the process has been a true development, not a perversion or corruption, from its evident naturalness; and in some cases from the gravity, distinctness, precision, and majesty of its advance, and the harmony of its proportions, like the tall growth, and graceful branching, and rich foliage, of some vegetable production. 2.