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First published in 1710, George Berkeley's A Treatise Concerning the Principles of Human Knowledge is a seminal contribution to Empiricist philosophy. Making the bold assertion that the physical world consists only of ideas and thus does not exist outside the mind, this work establishes Berkeley as the founder of the immaterialist school of thought. A major influence on such later philosophers as David Hume and Immanuel Kant, Berkeley's ideas have played a role in such diverse fields as mathematics and metaphysics and continue to spark debate today.

In Three Dialogues (set in a ‘Platonic’ garden), Hylas begins by challenging Philonous that he denied the existence of material substance. ‘What!’ says Hylas. ‘Can anything be more fantastical, more repugnant to Common Sense, or a more manifest piece of Scepticism, than to believe there is no such thing as matter?’ And Berkeley, in the guise of Philonous, replies, ‘Softly, good Hylas. What if it should prove that you, who hold there is, are, by virtue of that opinion, a greater sceptic, and maintain more paradoxes and repugnances to common sense, than I who believe no such thing.’

Berkeley uses the Socratic mode of inquiry in "Three Dialogues between Hylas and Philonous" to question fundamental beliefs about knowledge and reality. These dialogues are between Hylas (whose name is derived from the ancient Greek word for matter) and Philonous, whose name means "lover of mind." The new physical sciences developed in the seventeenth century supported the materialism proposed by Thomas Hobbes and several other philosophers. This worldview proclaimed that all of reality consists of nothing but matter in motion, thus promoting atheism and ethical skepticism.