In the saying from James Clavell's "Shōgun," it reflects the complexity of human emotions and relationships. People often wear a facade that they present to the outside world, manipulating their image to fit societal expectations. This false persona can differ significantly from their private self, which they reserve for close friends and family, revealing only certain truths while still guarding deeper vulnerabilities.

Ultimately, the quote highlights the hidden layers of a person’s identity, suggesting that the most genuine part of someone is rarely exposed to anyone but themselves. This secret aspect, known only to the individual and perhaps to God, underscores the idea that everyone harbors their true thoughts and feelings deep within, leading to a profound sense of isolation despite outward connections.