 While philosophers in ancient Greece raise sceptical questions concerning others, it is has been suggested that the problems they raise tend to be ‘thin’ rather than ‘thick’ ones (see  §1  and Avramides 2001). Plato and Aristotle, for example, discuss the value of friendship, but do not ask why we should think others exist to be friends. Sorabji claims that “it never occurs to Aristotle to raise doubts about other minds” (1974: 88). According to Sextus Empiricus, sceptics of the Cyrenaic school raise problems about the minds of others, but it is not clear that the problem they raise goes beyond the ‘thin’ one, How can I know what another thinks and feels? (Tsouna  1998a).[17]