In mosaics, however fine they may be, the limits of the stones are always there, and therefore no continuous passage from one colour to another is possible, and this is also the case with regard to concepts, with their rigidity and sharp delineation; however finely we may divide them by exact definition, they are still incapable of reaching the finer modifications of the perceptible, and this is just what happens in the example we have taken, knowledge of physiognomy.(16)
nahiz eta denik eta finena izan mosaikoa, beti gelditzen dira harriaren mugak eta horregatik ez da posible tindu batetik besterako igarobide iraunkorra; horrela dira kontzeptuak ere beren zurruntasun eta mugaketa zorrotzarekin, determinazio zehatzagoz nahiz eta oso sotilki zatitu nahi izan, ez da inoiz gai izango begiesgarriaren modifikazio sotilak lortzeko, zeinetara hemen adibidetzat hartutako fisiognomika iristen baita.