It is in the intelligent part of the soul that evil thoughts operate which excite desire and attempt to capture man’s nous so that sin is committed. The development of sin starts with thoughts. Therefore anyone who wishes to purify his inner world, to be released from sin, to be freed from the captivity of his nous must keep his intelligence safe from the impact of evil thoughts. So in this section we shall try to analyze what these thoughts are, what causes them, what results they produce in our spiritual organism, and finally what methods cure us of them. This is a very crucial matter because our spiritual death or spiritual life depend on our confronting them. Furthermore, as we shall see (pathology) in what follows, many physical abnormalities and illnesses originate from unbridled thoughts.
—Metropolitan Hierotheos of Nafpaktos