by instruction, and to correct his errors; he is not merely counselled to do this by reason as technically practical, with a view to his purposes of other kinds (as art), but reason, as morally practical, absolutely commands him to do it, and makes this end his duty, in order that he may be worthy of the humanity that dwells in him. Secondly, to carry the cultivation of his will up to the purest virtuous disposition, that, namely, in which the law is also the spring of his dutiful actions, and to obey it from duty, for this is internal morally practical perfection. This is called the moral sense (as it were a special sense, sensus moralis), because it is a feeling of the effect which the legislative will within himself exercises on the faculty of acting accordingly. This is, indeed, often misused fanatically, as though (like the genius of Socrates) it