Synthesized answer
The provided passages do not explicitly state the central thesis of the text "Neo-Confucian Orthodoxy and the Learning of the Mind-and-Heart" [Passage 1].
However, the description and snippet suggest that the book is a "major addition to our understanding of the development of Neo-Confucianism" [Passage 1]. It aims to illuminate Neo-Confucianism's "complexity, diversity, richness, and depth" [Passage 1] as a significant element in the "moral and spiritual fiber of the peoples of East Asia" [Passage 1].
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: Neo-Confucian Orthodoxy and the Learning of the Mind-and-Heart by Wm. Theodore De Bary Description: A major addition to our understanding of the development of Neo-Confucianism--its complexity, diversity, richness, and depth as a major component of the moral and spiritual fiber of the peoples of East Asia. Categories: Philosophy Pages: 290 Snippet: A major addition to our understanding of the development of Neo-Confucianism--its complexity, diversity, richness, and depth as a major component of the moral and spiritual fiber of the peoples of East Asia.