 “(1) The first is existence: when one inquires whether so-and-so exists; (2) the second is quiddity: when one inquires what so-and-so is; (3) the third is quality: when one inquires how so-and-so is; (4) the fourth is ‘quarity’: when one inquires why so-and-so is.” (Altmann and Stern, Isaac Israeli, pp. 10–11)