George Berkeley (March 12, 1685 January 14, 1753), also known as Bishop Berkeley, was an influential Irish philosopher whose primary philosophical achievement is the advancement of what has come to be called subjective idealism, summed up in his dictum, "Esse est percipi" ("To be is to be perceived"). Basically, the theory is that we can only directly know sensations and ideas of objects, not abstractions such as "matter". He wrote a number of works, the most widely-read of which are his Treatise Concerning the Principles of Human Knowledge (1710) and Three Dialogues between Hylas and Philonous (1713) (Philonous, the "lover of the mind", representing Berkeley himself). In 1734 he published The Analyst, a critique of the foundations of science, which was very influential in the subsequent development of mathematics..
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