Nicene and Post-Nicene Fathers: Series II/Volume XI/John Cassian/Conferences of John Cassian, Part I/Conference IV/Chapter 18

Chapter XVIII.

The question what is the difference between the carnal and natural man.

us, very clearly shown the value of the struggle which is raised between the flesh and spirit, so that we can believe that it can in a sort of way be grasped by us; and therefore we want to have this also explained to us in the same way; viz., what is the difference between the carnal and the natural man, or how the natural man can be worse than the carnal.
 * You have, it seems to