We are about to study the history of the movement in German theology, which is usually described by the vague name of Rationalism,(656)—a movement which, whether viewed specially in its relation to theology, or to literature generally, must be regarded as one of the most memorable efforts of human thought. It was one aspect of the great outburst of mental activity in Germany, which within the last hundred years has created a literature, which not only vies with the most renowned of those which have added to the stock of human knowledge, but holds a foremost rank among those which are characterised by originality and depth. The permanent contribution made by it to the thought of the world is the creation of a science of criticism,—a method of analysis, in which philosophy and history are jointly employed in the investigation of every branch of knowledge. If however it be viewed apart from the question of utility, the works produced during this period, in poetry, speculation, criticism, and theology, must ever make it memorable for monuments of mental power, even when they shall have become obsolete as sources of information. The theological aspect of this great period of mental activity, which we are about to sketch, has now probably so far assumed its final shape, and given indications of the tendencies permanently created by it for good or for evil, that it admits of being viewed as a whole, and its purpose and meaning observed.(657) We shall deviate slightly from the plan hitherto pursued, of selecting only the sceptical form of free thought, and shall give an outline of German theology generally; partly because the limits that sever orthodoxy from heresy are a matter of dispute, partly in order that the movement may be judged of as a whole. The size of the subject will preclude the possibility of entering so fully into biographical notices of the writers, or into the analysis of their writings, as in former lectures. We must select such typical minds as will enable us to observe the chief tendencies of thought. As the stages of history are not arbitrarily severed, but grow out of each other, we must briefly notice the mental conditions of the period in Germany which preceded the rise of rationalism; next indicate the new forces, the introduction of which was the means of generating the movement; and then explain the movement itself in its chief phases and present results.