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Does Berkley's empiricist philosophy contain any inconsistencies? What are the inconsistent sides of Locke's or Hume's philosophies? How is Berkeley's world different from a Matrix-like world?

The questions are motivated by the following exchange between Sophie and Alberto about Berkeley in Gaarder's philosophical novel Sophie's World:

“He felt that current philosophies and science were a threat to the Christian way of life, that the all-pervading materialism, not least, represented a threat to the Christian faith in God as creator and preserver of all nature.”
“He did?”
“And yet Berkeley was the most consistent of the empiricists.”
“He believed we cannot know any more of the world than we can perceive through the senses?”
“More than that. Berkeley claimed that worldly things are indeed as we perceive them, but they are not ‘things.’ “
“You’ll have to explain that.”
“You remember that Locke pointed out that we cannot make statements about the ‘secondary qualities’ of things. We cannot say an apple is green and sour. We can only say we perceive it as being so. But Locke also said that the ‘primary qualities’ like density, gravity, and weight really do belong to the external reality around us. External reality has, in fact, a material substance.”
...
“This is just what Berkeley questioned, and he did so by the logic of empiricism. He said the only things that exist are those we perceive. But we do not perceive ‘material’ or ‘matter.’ We do not perceive things as tangible objects. To assume that what we perceive has its own underlying ‘substance’ is jumping to conclusions. We have absolutely no experience on which to base such a claim.”

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  • I read it in Sophie's World and I really couldn't accept so I asked here. imgur.com/a/mUwV2cT – Z. KM Apr 23 '20 at 10:29
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    Alberto is only half right, Berkeley said that to be is to be perceived or to perceive. He leaps to postulating a "perceiver" in a Descartes-like fashion, and then invents a whole metaphysics of perceivers topped by God, with little empirical evidence, like Locke with matter. Hume is more consistent in this regard. He is skeptical of "self", it is just a nominalistic bundle of relations, of causality, it is just a flow of associations, etc., so of the three he gets the prize. Later empiricists, like Quine or Goodman, go even further in their skepticism about any kind of metaphysics than Hume – Conifold Apr 23 '20 at 21:56
  • Hi Z.KM, welcome to Phil.SE. I've rephrased your question to sound more objective. – Yechiam Weiss Apr 24 '20 at 10:35
  • Thanks for your efforts @Conifold and Yechiam – Z. KM Apr 24 '20 at 12:00
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A major problem Berkeley would face today was actually solved in his time with what I would actually consider one of the most elegant solution to a philosophical argument ever proposed. In a famous incident, Ronald Knox raised a major criticism to Berkley with a limerick:

There once was a man who said "God
Must think it exceedingly odd
If he finds that this tree
Continues to be
When there's no one about in the Quad."

An unknown individual solved this problem with another limerick:

Dear Sir, Your astonishment's odd.
I am always about in the Quad.
And that's why the tree
Will continue to be
Since observed by Yours faithfully, God

Although this argument is an amazingly simple solution that completely and unambiguously solves the problem (something that almost never happens in philosophy), it relies on the axiom that an omniscient being exists. In the centuries since this argument have been published, such an assumption has fallen out of fashion.

On the other hand, I can think of a possible solution Berkeley could propose that would also solve the problem. Unfortunately, it relies on quantum field theory and faces problem from special relativity. Considering how both of these things have been horrible misused in amateur philosophers like me in the past, I am going to save myself a lot of embarrassment by not posting it unless someone asks me to.

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"Inconsistency" is too assertive a word for philosophy. Let me draw an analogy between philosophy and chess. In master-level chess, there are strong and weak moves, rarely, there are right or wrong moves (mostly, they occur in cramped positions with very few choices). Likewise in philosophy, there are strong or weak arguments, incipient or mature views, but statements that can be plainly said to be true or false occur rarely and so do inconsistencies. Philosophical theories are too large to be tested; the main force of philosophical advancement is enrichment and sharpening of concepts, while introducing novel ones; not replacing one theory with another. In this respect, philosophy is closer to mathematics than science. So, we had better reserve the term "inconsistency" for formal contexts.

It is a good practice to stay away from formulaic definitions of mainstream views like empiricism, rationalism, etc. and try to view them as methodological frameworks in which a dominant thread runs throughout, shaping various questions and answers

To have a glimpse of the relevance of Berkeley's views to today's concerns, I'd advise you to read Popper's paper A Note on Berkeley as Precursor of Mach (1953, The British Journal for the Philosophy of Science 4, pp. 26-36).

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