History
Thinkers such as Plato, Plotinus and Augustine of Hippo anticipated idealism's antimaterialism with their views of the inferior or derivative reality of matter. However, these Platonists did not make Berkeley's turn toward subjectivity. Indeed, Plato rationalistically condemned sense-experience, whereas subjective idealism presupposed empiricism and the irreducible reality of sense data. A more subjectivist methodology could be found in the Pyrrhonists' emphasis on the world of appearance, but their skepticism precluded the drawing of any ontological conclusions from the epistemic primacy of phenomena.
The first mature articulations of idealism arise in Yogacarin thinkers such as the 7th-century epistemologist Dharmakīrti, who identified ultimate reality with sense-perception. The most famous proponent of subjective idealism was the 18th-century Irish philosopher George Berkeley, although Berkeley's term for his theory was immaterialism. From the point of view of subjective idealism, the material world does not exist, and the phenomenal world is dependent on humans. Hence the fundamental idea of this philosophical system (as represented by Berkeley or Mach) is that things are complexes of ideas or sensations, and only subjects and objects of perceptions exist. Berkeley summarized his theory with the motto "esse est percipi" ("To be is to be perceived"), but went on to elaborate it with God as the source of consensus reality and other particulars.
According to Berkeley, an object has real being as long as it is perceived by a mind. God, being omniscient perceives everything perceivable, thus all real beings exists in the mind of God. However, it is also evident that each of us has free will and understanding upon self reflection, and our senses and ideas suggest that other people also possess these qualities as well. According to Berkeley there is no material universe, in fact he has absolutely no idea what that could possibly mean. To theorize about a universe that is composed of insensible matter is not a sensible thing to do. This matters because there is absolutely no positive account for a material universe, only speculation about things that are by fiat outside of our minds.
Berkeley's assessment of immaterialism was criticized by Samuel Johnson, as recorded by James Boswell. Responding to the theory, Dr. Johnson exclaimed "I refute it thus!" while kicking a rock. This episode is cited by Stephen Dedalus in James Joyce's "Ulysses," chapter three. Reflecting on the "ineluctable modality of the visible," Dedalus conjures the image of Johnson's refutation, before engaging in his own refutation - closing his eyes and feeling the rocks under his feet while walking along the beach. However, Berkeley did not confine his theory to visual perception, but perception by any of the senses.
The simplest and most common version of subjective idealism combines subjunctive phenomenalism, the view that statements about physical objects can be translated into subjunctive conditionals about perceptions, with belief in immaterial minds.
Read more about this topic: Subjective Idealism
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