This quote suggests that there are many people who claim to understand or know a character, Jack Fool, better than he knows himself. It implies that superficial understanding and judgment often overshadow deeper knowledge and introspection. The emphasis lies in the irony that those who appear to be knowledgeable may actually lack true insight.

In Shakespeare's "King Lear," this notion reflects the complexities of perception and the folly of assuming one truly comprehends another's experiences or thoughts. It highlights the gaps between public personas and internal realities, encouraging a deeper examination of relationships and knowledge.