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who said esse est percipi ?

### Esse Est Percipi: A Philosophical Dive

#### Who Said “Esse Est Percipi”?
The phrase “Esse est percipi,” meaning “To be is to be perceived,” is famously attributed to the Irish philosopher George Berkeley. However, the origins of this idea extend much further back in the annals of philosophy. We must consider other philosophers and ideas that have paved the way for Berkeley’s ultimate formulation.

#### The Ancient Prelude
The concept encapsulated in “Esse est percipi” traces back to ancient Greek philosophy. Parmenides, the pre-Socratic philosopher who lived in the 6th century BC, in his famous “Poem,” provides a starting point. Parmenides stated that “the same is to think and to be,” suggesting a deep connection between perception and existence.

#### George Berkeley’s Contribution
George Berkeley, an 18th-century philosopher and bishop, articulated the idea in a more formal and nuanced manner as part of his subjective idealism. Berkeley contended that the material world is merely ideas perceived by minds and does not exist independently of perception. His doctrine, “Esse est percipi,” is a cornerstone of his philosophy and is sometimes expanded to “Esse est percipi aut percipere,” meaning “To be is to be perceived or to perceive.”

Berkeley’s view was revolutionary in that it essentially denied the existence of material substance. Instead, he posited that only minds and their ideas truly exist. In his seminal work, *Principles of Human Knowledge* (1710), Berkeley wrote, “The esse of these things is to be perceived; and it is not possible they should have any existence without a mind to perceive them.” This argument challenges the very foundations of reality as understood by materialists.

#### Philosophical Repercussions
Berkeley’s philosophy has profound implications. From an epistemological perspective, it turns our understanding of knowledge on its head, questioning how we can know anything about the material world if we cannot perceive it directly. It also leads into the realm of solipsism, the doctrine that only one’s own mind is sure to exist, an extreme form of subjective idealism.

#### Modern Interpretations
Contemporary philosophy and cognitive science grapple with Berkeley’s ideas in new ways. The notion that existence is inextricably linked with perception is reminiscent of recent discussions about the nature of reality, consciousness, and the role of the observer in modern physics. Quantum mechanics, with its observer-dependent nature, presents scenarios where the act of perception does indeed influence the world.

#### Conclusion
“Esse est percipi” invites us to consider the relationship between perception and reality in a profound and unsettling way. Berkeley’s dictum suggests that what we experience as the material world is merely a series of ideas within minds. This philosophical conundrum challenges us to re-evaluate our beliefs and perceptions about the nature of existence.

So, who said “Esse est percipi”? While the philosophical underpinnings of this idea stretch back to the Greek philosophers, it was George Berkeley who formalized and popularized this radical notion that existence is fundamentally tied to perception. Today, Berkeley’s ideas continue to resonate, inspiring philosophical inquiry and debate into the very nature of reality.