The quote from Peter S. Beagle's "The Last Unicorn" suggests that our perceptions of the universe are deceptive. It implies that the reality we experience through our senses does not reflect the true nature of existence. Our senses can mislead us, presenting a false image of the world around us. This raises questions about the reliability of our understanding and interpretation of what we perceive.

Furthermore, the quote extends this idea to humanity itself, suggesting that if our senses deceive us, we, too, are prone to deception. It highlights a philosophical view that our attempts to understand and communicate truth may be flawed. In this context, the nature of truth becomes complex, revealing that our quest for understanding might often result in us being "liars" in the broader sense, shaped by our limited perceptions.