It has always been my belief that it is not enough for somebody to claim that he is Greek, if he cannot prove that he is indeed Greek and that it is not enough for somebody to live in Greece to be called a Greek. [...] Racial constitution is the decisive factor of nationality. But this point needed to be proved, verified scientifically and to be followed by research focusing on the Greeks people and their racial and thus national identification. Only in this way could any one say that he is Greek -if he really is one- and that he descends from the ancient Greeks -if he really does. [...] (from the preface)