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Esse est Percipi "To be is to be perceived"​

Instrumentalism and Idealism​

Bishop Berkeley

"It is evident to anyone who takes a survey of the objects of human knowledge, that they are either ideas actually imprinted on the senses; or else such as are perceived by attending to the passions and operations of the mind; or lastly ideas formed by help of memory and imagination—either compounding, dividing, or barely representing those originally perceived in the aforesaid ways"

Dr Johnson

When discussing how Berkeley's philosophy appeared to be self-evidently false, but impossible to refute, Dr. Johnson kicked out at a nearby stone, exclaiming "I refute it thus!"

James Boswell, anecdote of an event of 6 August 1763, in The Life of Samuel Johnson (1791), Vol. I

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