We are already acquainted with this freedom. We approach now the main question: What is the true relation of the freedom, which man may rightly claim for his scientific activity and reason, to external laws and regulations? Is man really justified to reject them all on the plea that they degrade his intellect and are an obstacle to his development, or does this rejection but manifest an error into which his desire of freedom has decoyed him? This is the question, it will be remembered, that we reached soon in the beginning of our investigation. We have already found the categorical answer—an emphatic rejection of such justification; we also traced the hypotheses on which the answer rests. We now return to the question to discuss it in principle. We begin with the freedom of scientific _research_, in order to take up afterwards the freedom in _teaching_. What are those external powers that may interrupt or caution the scientist in his investigations and problems? Here we do not yet consider the scientist as a teacher, communicating to the public the result of his investigation, his ideas and views, from the university chair to his scientific audience, or to a wider circle of hearers by means of publications; we here regard him in his private study only, in the pursuit of which he perhaps encounters new questions, and new solutions suggest themselves to him. What freedom can he and must he enjoy here? This private freedom must evidently be judged from a point of view other than that from which the freedom in teaching should be judged. With the latter, the interests of his contemporaries must be taken into account, and the question must be considered, whether they suffer by such teaching. The freedom of the scientist is greater than that of the teacher. Moreover, research is the principal and most important activity of science: nothing, surely, is taught that has not been previously investigated. If, therefore, research is in any way restricted, so also is teaching; but not _vice versa_. Are there, then, exterior authorities that may restrain research and reasoning, and what are they? One who lives in the Christian world knows at once of what authority to think. It is not the state. The state cannot directly influence the private work of the student: if it may exert its influence directly upon anything, it is only upon freedom in teaching. No, the authority to think of is the authority of the faith, revealed religion and its guardian, the Church.