We shall therefore have to distinguish between freedom of research and freedom of teaching. The neglect of this distinction causes not a little confusion; thus, if one complains of his convictions being trammeled or his liberty of conscience being violated, when he is hindered from immediately proclaiming whatever he calls his convictions. Private opinion, and the public propaganda of this opinion, are evidently very different things. It may be that an opinion seems to me the right one, but, in spite of that, public dissemination of it may, always or under certain circumstances, mean danger to my fellow-men. If I am for this reason prevented from publishing it, I am not thereby hindered from giving it my own private assent. It is, moreover, quite clear that the state—we disregard here religious authority—cannot at all directly restrict research, which is something personal. It can only impose restrictions on the communication of one’s ideas by teaching them to others, which is a social function. From these few remarks will be followed the impropriety of the following, or similar, observations: “The fostering of science and its teaching are not separate functions ... to insinuate a twofold function of freedom, viz., that of the savant and that of the teacher, would be to dissolve the unity of the moral personality” (_W. Kahl_, Bekenntnissgebundenheit und Lehrfreiheit (1897), 22). It is not at all double-dealing if some one does not publicly proclaim one’s private knowledge. Is it double-dealing, is it a violation of “the unity of the moral personality,” if one is, and must be, silent about official secrets? And if one does not tell, and is not allowed to tell, official secrets, if one prevents an anarchist from spreading his revolutionary ideas, is this a violation of the unity of the moral personality? It is true that “to deny one’s convictions is a violation of one of the most indubitable principles of moral conduct” (_K. v. Amira_, Die Stellung des akademischen Lehrers zur Freiheit in Forschung und Lehre. Beilage der Muenchener Neuesten Nachrichten. 9. Juli, 1908). But it is logically incorrect to conclude therefrom that the freedom of teaching should not be restricted. To keep silence is not denying one’s convictions. Later on, when speaking of freedom in teaching, we shall return to this thought and deal with it more thoroughly. So far there can be no serious diversity of opinion. Freedom from unjust restraint is demanded, and rightly demanded, for science. The very object of science requires it. In scientific research man’s power of discernment should freely develop; his inclination towards truth should exert itself; and by communication of acquired knowledge mankind should advance in mental and material culture.