Life of humbleness & meekness (12)
Pope Shenouda III
Thinking highly of oneself leads to a desire for being great in the sight of the others, and even in the relationship with God, causing one to fall in blasphemy, as the case with the Satan and many atheists.
It is arrogance, and it is often divided into three types:
Arrogance related to secular matters, arrogance related to monasticism, and arrogance related to dogmatic and theological issues.
Secula