The Prophet appears to dwell on points by no means doubtful: he has already spoken of the four heads, then why does he repeat it? Because he was dealing with a dull and perverse people: they were also slow in receiving the Prophet's doctrine: and they added this vice worse than all the rest, namely, a constant and open endeavor to detract from the authority of all the Prophets. For this reason the Prophet says, that there were four heads and four wings to each living creature, lest the Jews should scoffingly deride it as an empty specter and delusion of the Prophet, because he thought he saw what had no existence. For this reason he inculcates more frequently what. was sufficiently clear by itself had the Jews been docile and obedient. It follows --