Gregory of Nazianzus on the Demands for Correct Conduct

For if it were possible for everyone to be the noblest and attain the summit of virtue, this would certainly be most excellent and most perfect. But, since the divine nature is distinct from human nature and since the former has a share in nothing which is not good while the latter would consider it a great achievement to be mediocre, why do you prescribe rules which are impossible for everyone to obey unless you desire to condemn those who do not keep them? For just as someone who does not deserve chastisement does not automatically deserve commendation, in the same way someone who does not deserve commendation does not automatically deserve punishment: we must remain within the limits of our philosophy and of human capability in order for us to define our demands for correct conduct.

Gregory of Nazianzus, Oration 4.99 (trans. by Bradford Lee Fipps)