A Treatise Concerning the Principles of Human Knowledge

George Berkeley also known as Bishop Berkeley was an 18th century philosopher. His theory of immaterialism" was later referred to as "subjective idealism. This theory, summed up in his dictum, "Esse est percipi," which states that individuals can only directly know sensation and ideas of objects not abstractions such as matter. Berkeley wrote A Treatise Concerning the Principles of Human Knowledge (1710) and Three Dialogues between Hylas and Philonous (1713).