In "Liar's Poker," Michael Lewis presents the idea that people often rely heavily on appearances rather than deeper truths. Niccolò Machiavelli's quote emphasizes that while many can observe how individuals appear to others, only a few truly understand their authentic selves. This disparity highlights the challenge of overcoming societal perceptions and understanding the complexities of character beneath the surface.

Furthermore, the quote suggests a certain cowardice among individuals who, despite possessing awareness of a person's true nature, choose not to challenge popular opinions. In a world where visual impressions dominate judgment, the reality of a person's character can be obscured, pointing to the broader implications of how reputation can shape interactions and beliefs in society.