One of the greatest British philosophers, Bishop Berkeley (1685 - 1753) was the founder of the influential doctrine of Immaterialism - the belief that there is no reality outside the mind, and that the existence of material objects depends upon their being perceived. The Principles of Human Knowledge eloquently outlines this philosophical concept, and argues forcefully that the world consists purely of finite minds and ideas and of an infinite spirit, God. A denial of all non - spiritual reality, Berkeley's theory was at first heavily criticized by his contemporaries, who feared his ideas would lead to scepticism and atheism. The Three Dialogues provide a powerful response to these fears. Fascinating and profoundly influential, these works formed the foundation of the empirical movement that led directly to the thought of John Stuart Mill and the Linguistic Phenomenalism of A. J. Ayer. The introductions to both texts, by Roger Woolhouse, lucidly explain Berkeley's philosophy and outline its heritage. This edition also includes detailed notes.Berkeley, George is the author of 'Principles of Human Knowledge & Three Dialogues Between Hylas & Philonous ', published 1988 under ISBN 9780140432930 and ISBN 0140432930.