Chu Hsi (1130-1200) was indisputably the most influential Chinese thinker after Confucius and Mencius. Because his philosophy of Neo-Confucianism dominated East Asian thought and institutions for centuries, scholars in Asia and the West have concentrated on his philosophical doctrines and political career leaving much of his personal life an character unaccounted for. In this volumne, the world's leading authority on Chu Hsi presents aspects of his life and thought that have hitherto been overlooked. The essays in this volumne constitutue a fresh portrayal of Chu Hsi and create for the first time a total picture of the man, his circle, and his thought.
This is really in-depth knowledge, from the world's leading Zhu Xi scholar. Unfortunately, the book just isn't that great. That said, if you need to delve into the specifics of what Zhu thought about particular topics like "quiet sitting" or "tian," then it's useful (if you can even find a copy).