INTRODUCTION

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      During the fierce theological controversies that accom panied and followed the Reformation, while a judicial spirit was as yet unknown, while each party imagined itself the representative of absolute and necessary truth in opposition to absolute and fatal error, and while the fluctuations of belief were usually attributed to direct miraculous agency, it was natural that all the causes of theological changes should have been sought exclusively within the circle of theology. Each theologian imagined that the existence of the opinions he denounced was fully accounted for by the exertions of certain evil-minded men, who had triumphed by means of sophistical arguments, aided by a judicial blindness that had been cast upon the deluded. His own opinions on the other hand, had been sustained or revived by apostles raised for the purpose, illuminated by special inspiration, and triumphing by the force of theological arguments. As long as this point of view continued, the position of the theologian and of the ecclesiastical historian was nearly the same. Each was confined to a single province, and each, recognising a primitive faith as his ideal, had to indicate the successive innovations upon its purity. But when towards the close of the eighteenth century the decline of theological passions enabled men to discuss these matters in a calmer spirit, and when increased knowledge produced more comprehensive views, the historical standing-point was materially altered. It was observed that every great change of belief had been preceded by a great change in the intellectual condition of Europe, that the success of any opinion depended much less upon the force of its arguments, or upon the ability of its advocates, than upon the predisposition of society to receive it, and that that predisposition resulted from the intellectual type of the age. As men advance from an imperfect to a higher civilisation, they gradually sublimate and refine their creed. Their imaginations insensibly detach themselves from those grosser conceptions and doctrines that were formerly most powerful, and they sooner or later reduce all their opinions into conformity with the moral and intellectual standards which the new civilisation produces. Thus, long before the Reformation, the tendencies of the Reformation were manifest. The revival of Grecian learning, the development of art, the reaction against the schoolmen, had raised society to an elevation in which a more refined and less oppressive creed was absolutely essential to its well-being. Luther and Calvin only represented the prevailing wants, and embodied them in a definite form. The pressure of the general intellectual influences of the time determines the predispositions which ultimately regulate the details of belief, and though all men do not yield to that pressure with the same facility, all large bodies are at last controlled. A change of speculative opinions does not imply an increase of the data upon which those opinions rest, but a change of the habits of thought and mind which they reflect. Definite arguments are the symptoms and pretexts, but seldom the causes of the change. Their chief merit is to accelerate the inevitable crisis. They derive their force and efficacy from their conformity with the mental habits of those to whom they are addressed. Reasoning which in one age would make no impression whatever, in the next age is received with enthusiastic applause. It is one thing to understand its nature, but quite another to appreciate its force.

      And this standard of belief, this tone and habit of thought, which is the supreme arbiter of the opinions of successive periods, is created, not by the influences arising out of any one department of intellect, but by the combination of all the intellectual and even social tendencies of the age. Those who contribute most largely to its formation are, I believe, the philosophers. Men like Bacon, Descartes, and Locke have probably done more than any others to set the current of their age. They have formed a certain cast and tone of mind. They have introduced peculiar habits of thought, new modes of reasoning, new tendencies of enquiry. The impulse they have given to the higher literature, has been by that literature communicated to the more popular writers; and the impress of these master-minds is clearly visible in the writings of multitudes who are totally unacquainted with their works. But philosophical methods, great and unquestionable as is their power, form but one of the many influences that contribute to the mental habits of society. Thus the discoveries of physical science, entrenching upon the domain of the anomalous and the incomprehensible, enlarging our conceptions of the range of law, and revealing the connection of phenomena that had formerly appeared altogether isolated, form a habit of mind which is carried far beyond the limits of physics. Thus the astronomical discovery, that our world is not the centre and axis of the material universe, but is an inconsiderable planet occupying to all appearance an altogether insignificant and subordinate position, and revolving with many others around a sun which is itself but an infinitesimal point in creation, in as far as it is realised by the imagination, has a vast and palpable influence upon our theological conceptions. Thus the commercial or municipal spirit exhibits certain habits of thought, certain modes of reasoning, certain repugnances and attractions, which make it invariably tend to one class of opinions. To encourage the occupations that produce this spirit, is to encourage the opinions that are most congenial to it. It is impossible to lay down a railway without creating an intellectual influence. It is probable that Watt and Stephenson will eventually modify the opinions of mankind almost as profoundly as Luther or Voltaire.

      If these