Outline of a Nominalist Theory of Propositions: An Essay in the Theory of Meaning and in the Philosophy of Logic Book

George Berkeley was an English philosopher in the empiricist school. In this short treatise, he put forward many of his most influential ideas, including his critique of intellectual abstraction, and the dependence of reality on perception.

Unlike many other philosophers I've come across, Berkeley is direct and terse. He does not insult the reader's intelligence by dwelling unnecessarily on one topic, but moves forward at a brisk pace. Further, his writing is clear, organized, and he actively seeks to anticipate any objections that others might have to his points. This combination serves to make the Principles of Human Knowledge an enjoyable read.

I believe that this work can be read advantageously by anybody. However, those reader's who have knowledge of Descartes and Locke might get quite a bit more out of it. Much of what is contained in this little work is an elaboration, refinement, and at times a refutation of Locke's points in An Essay Concerning Human Understanding. In that work, Locke famously argues that the mind is a "blank slate" and that all of our thoughts are ultimately beholden to our experience. The "self" could not exist without sensation. Locke also points out that our sensations are only secondary qualities of objects. The primary qualities, or the arrangement of particles that actually make up an object, are largely unknowable. But Locke still believes they're there.

This was largely a response to Descartes and the rationalist school. In his Discourse on Method and Meditations, Descartes takes a sceptic stance, and maintains that all we perceive cannot be accepted as true. After all, we perceive things in dreams, but nobody thinks that those actually happen. He then concludes that all we can be sure of to exist is ourselves, and God. All external reality is doubtful.

Berkeley's position is the exact reverse. Far from saying that we should not trust our senses, Berkeley argues that nothing exists without us perceiving it. Instead of senses being an imperfect window to reality, or untrustworthy phantasms, sensations become synonymous with reality. (This goes further than Locke, as Berkeley argues that no such "primary qualities" exist, only secondary.) Descartes finds God as he meditates within himself. Berkeley finds God in everything we see, hear, touch, taste, and smell. The two views could not be more dissimilar.

I would suggest this little book to any who wish to learn more about philosophy, but don't want to get bogged down in a 400 page book. It's enjoyable, short, and surprisingly relevant.