  It will now be asked: ‘Well, what is this nature, this sortal attribute? Let’s have it specified!’ But such a demand is misconceived. Of course, I can give it a verbal label: for instance, I can call it ‘subjectness’ or ‘selfhood’. But unless they are interpreted ‘ostensively’, by reference to what is revealed by introspective awareness, such labels will not convey anything over and above the nominal essence of the term ‘basic subject’. In this respect, however, there is no difference between this attribute, which constitutes the subject’s essential nature, and the specific psychological attributes of his conscious life…