According to the orthodox Thomism of the Roman Catholic Church, Aristotle rightly regarded reason as a facility of the individual soul. Against this, the Averroists, led by Agostino Nito, introduced the modifying theory that universal reason in a sense individualizes itself in each soul and then absorbs the active reason into itself again. These two theories respectively evolved the doctrine of individual and universal immortality, or the absorption of the individual into the eternal One.
The Alexandrists, led by Pietro Pomponazzi, boldly assailed these beliefs and denied that either was rightly attributed to Aristotle. They held that Aristotle considered the soul as a material and therefore a mortal entity which operates during life only under the authority of universal reason. Hence the Alexandrists denied the possibility of any form of immortality, holding that, since the soul is organically connected with the body, the dissolution of the latter involves the extinction of the former.