"No person can ever know everything that is in the heart of another. We are all Face Dancers in our souls"

This quote by Brian Herbert talks to the idea that we can never truly know what is in the heart of another individual. We can never completely comprehend the thoughts, feelings, and inspirations of another person, no matter how close we are to them. We can only ever rate what remains in the heart of another individual. Herbert compares this to the idea of a Face Dancer, which is a character in his Dune series that can alter their physical look to match the expectations of those around them. In this method, Herbert recommends that all of us have the ability to alter our outside look to fit the expectations of those around us, while our inner selves remain covert and unknowable. This quote speaks to the idea that we should bear in mind the truth that we can never ever really understand what is in the heart of another individual, which we need to be respectful of the privacy of others.