 The things in common which all the people of the excellent city ought to know are: (1) In the first place to know the First Cause and all its qualities; (2) then the immaterial existents [including the above mentioned active intellect] …; (3) the celestial substances …; (4) [without number in Walzer’s translation] then the natural bodies which are beneath them, and how they come to be and pass away …; (5) then the generation of man; (6) then the first ruler …; (7) then the rulers who have to take his place …; (8) then the excellent city and its people and the felicity which their souls ultimately reach …. (Perfect State V, 17, 1: 277–9)