On A number of occasions in the Principles , Berkeley defends himself against the possible objection that ‘by the foregoing principles, all that is real and substantial in nature is banished out of the world; and instead thereof a chimerical scheme of ideas takes place. All things that exist, exist only in the mind.… What therefore becomes of the sun, moon, and stars? … Are all these but so many chimeras and illusions on the fancy ?’.

Although several passages in Berkeley are related to the question whether two or more finite substances can simultaneously perceive numerically identical sensible ideas, it is only in TDHP (247–8) that he addresses the question explicitly and in some detail. Yet, Berkeley’s less than straightforward reply is notoriously difficult to pin down. Some commentators take Berkeley to be endorsing a clear‐cut positive reply, whereas others have him giving an emphatically negative one; others hold that for Berkeley there is no fact of (...) the matter that determines an answer one way or the other. I argue that all three readings find some justification at one point or another in the passage, and all hold a kernel of truth. Yet, none of them can be taken unrestrictedly because Philonous’s considered position is disjunctive: either there is no problem at all, or, if there is one (thus warranting a negative reply to the public status of sensible ideas), it makes equally against ‘materialism’ and immaterialism. I argue that the passage can be given an overall interpretation that explains why Berkeley is entitled to hold that there is some truth in each direction. I propose answers to the questions (a) why Berkeley thinks there may nevertheless be a problem after all, and (b) if so, why he can yet legitimately feel entitled to let it rest, that is, why he remains confident, within the philosophical context of his day, that his philosophy does not lead to solipsism. (shrink)

The subject of this study is an ambiguity which is deeply rooted in Berkeley's arguments against matter. By a is shift between two meanings of the term ‘sensible’, he is able to construct a simple “refutation” of matter. Berkeley then attempts to show that this argument is irrefutable. The ambiguity of the original argument is, however, contained in the train of supporting arguments. My purpose in bringing attention to this ambiguity is not just to reveal a mistake in Berkeley's arguments (...) against matter. This particular mistake, I believe, deserves scrutiny not only because it is a mistake, but also because it explains the strategy and order of Berkeley's arguments against matter. Furthermore, if this explanation is correct, then some light can be cast on some puzzling features of Berkeley's philosophy. (shrink)

Berkeley’s Principles is a curious work. The nominal topic is epistemic. The actual topic is ontological. And it is not uncommon to suggest that ‘Berkeley’s system presents us with unique puzzles, particularly at its foundation.’.