From a letter of St. Alexander, bishop of Alexandria, to Æglon, bishop of Cynopolis, against the Arians.
1. Natural will is the free faculty of every intelligent nature as having nothing involuntary which is in respect of its essence.
2. Natural operation is the innate motion of all substance. Natural operation is the substantial and notifying reason of every nature. Natural operation is the notifying virtue of every substance.
Reproduced in full. Translation: Ante-Nicene Fathers, vol. 6 (Roberts and Donaldson, 1886), public domain (Public domain).