When you conceal your will from others, that is Thick. When you impose your will on others, that is Black. —Lee Zhong Wu
Thick Face = The Shield. Conceal your will from others. Create your own positive self-image regardless of what others say. Adapt to situation without regard of what others think of you.
Black Heart = The Spear. Impose your will on others. Take actions without regard how consequences influence others. Have courage to fail.