“Do nothing from selfishness or conceit, but in humility count others better than yourself.”
C.S. Lewis, in “Screwtape Proposes a Toast,” identified self-esteem, “I’m as good as anyone else!” as a tool of the devil.
A lot of Lewis’s ideas are quite Orthodox—the soteriology of “The Great Divorce” and a lot of the theological hints dropped in the Narnia series are very non-Western. I know Lewis had a close Orthodox friend (whose name escapes me), was very fond of the Orthodox liturgy (remarking that it was better than anything in the West, and apparently considered conversion, but, living at a time whan Orthodox-Anglican union was still a seemingly live issue, never took the step. Indeed, some Orthodox jokingly speak of ‘our father among the saints Clive Staples Lewis’ even though he remained an Anglican all his life.