Thick Face, Black Heart is a theory of great practical use. It can be applied to any endeavor, and utilized for either good or evil purposes. The first superficial exposure to Thick Face, Black Heart is often shocking and repellent because it can serve the criminal as easily as the saint. It seems to be a selfish, ruthless, and completely amoral concept. However, I contend that these do not necessarily have to be destructive attributes. As the name implies, there are two elements to this inward state: the Thick Face and the Black Heart.
Chu, Chin-Ning (2010-01-13). Thick Face, Black Heart: The Warrior Philosophy for Conquering the Challenges of Business and Life (p. 10). Grand Central Publishing. Kindle Edition.
Thick Face; Black Heart, p. 9