This is part three of a three part examination of Berkeleyan subjective idealism. Part two can be found here. Part one can be found here.

When it comes to epistemology, the mind through its innate intellectual capacity to make judgments, utilizes the laws of logic as the starting points of understanding reality. The first principles of knowledge are innate intellectual capacities or functions of the mind by virtue of the mind’s ability to know reality and make judgments about it. Realists, therefore, are innatists, meaning that certain functions of the mind are innate, simply because the mind is an essential feature of being human. Judgment is a natural part of the human intellect. One may not immediately understand the first principles they are using, but they may be easily affirmed and recognized through education and reflective questioning just as Plato demonstrated with the slave-boy in the Meno dialogue, and as Aristotle affirms as intuitively correct in his Posterior Analytics¹. Therefore, the human mind has an innate, or natural capacity to understand reality through judgment but knowledge is developed explicitly through discussion, questioning, examination, and education. Even the empirically-minded Aquinas believes that the mind has a natural tendency for understanding first principles. Aquinas explains, “Each power of the soul is a form or nature, and has a natural inclination to something. Therefore each power desires by the natural appetite that object which is suitable to itself” (Ia q. 80, a. 1, ad. 3). And, “The natural appetite is that inclination which each thing has, of its own nature, for something” (Ia, q. 78, a. 1, ad 3). For Aquinas, and most forms of realism, human beings have innate first principles or cognitive functions of the intellect. When these mental capacities are given the content of sense experience, human beings are able to come to a correct knowledge of reality. This also means that deductive rational reasoning and empirical experience work together symbiotically.

Of course, one could examine many other first principles of reality such as the law of universality, the principle of causality, the principle of finality, or the more narrow principles of induction or empiricism, but the most important are the laws of logic because they apply equally to metaphysics and epistemology. Just as there are different faculties of the mind, there are logical first principles which are related ontologically and epistemically. These first principles come from the innate cognitive faculty of judgment and are derived from reality itself because one cannot deny what is. In fact, the foundational principles of knowing and logic are properties of being itself. Aquinas thinks that understanding the basic first principles of being is an act of wisdom,

“Now to know the meaning of being and non-being, of whole and part, and of other things which follow on being, which are the terms of which indemonstrable principles are constituted, is the function of wisdom … And so wisdom makes use of indemonstrable principles which are the object of understanding not only by drawing conclusions from them, as other sciences do, but also by passing its judgment on them, and by vindicating them against those who deny them.” (I-II, q. 66, a. 5, ad. 4)

Here, it becomes important to review the first (or primary) laws of logic, because they relate to both existence (what can or cannot be), and how one knows it (what can or cannot be known). The laws of logic have both metaphysical and epistemic implications. As such, they set forth the first principles of reality and knowledge. The first principle of knowledge is the law of noncontradiction. The law of noncontradiction states that nothing can both be, and not be at the same time and same respect. This is a metaphysical and ontological claim because being cannot both exist, and not exist in the same manner (no object has that property including being itself). This principle is simply expressing the notion that being and nonbeing are ontologically different things and is why the law of noncontradiction is a property reality itself. The first judgment the mind makes when it experiences anything is that something is rather than is not, which makes it also an epistemic principle of reality. The law of excluded middle is equally important. The law of excluded middle is the principle that something either is, or it is something else, but cannot be both at the same time.² Something must either be, or not be. A sea creature is either a fish, or a cephalopod, but not both at the same time or something in-between. Metaphysically, something cannot both be and not be in the same manner. Language depends on this principle as well—a statement is either true or false, but not both at the same time. If that were not the case, all meaningful communication would collapse into incoherence. Finally, the law of identity indicates the unity of things and being itself. Metaphysically, the law of identity draws one’s attention to the fact that a thing is what it is. The unity of being speaks to the fact that being is, and is intelligible. There are fundamental universal consistencies of being which make something what it is and intelligible to the mind. Epistemologically, a true statement must be true, a false statement must be false. These are the first principles of reality and all human knowledge. These principles are not mind dependent, they are properties of objective being and reality.

The innate ability of the mind to make determinations and judgments about reality does not mean that the mind is ultimate in determining reality. Contrary to Berkeley, being is not a construct of the mind. The mind apprehends being, but does not create it. Rather, the first principles of knowledge point to the fact that the mind is subservient to being. It first receives being, then makes a judgment according to what is or is not (the law of noncontradiction). But “what is” is unaffected, unchanged, and essentially untouched whether or not it is perceived. The only reason I can say that Los Angeles is in California and that I exist is because reality is that way. Berkeleyan idealism holds that all reality is mind-dependent and a construct of mental perception (whether one’s own or an eternal spirit’s). Realists maintain that the mind does not construct reality, it conforms to it. When I fly on an airplane to Los Angeles, I must adjust to this objective reality—including the ultimate principles that will get me there—the principle of causation, the principle of predictive uniformity, and various other laws of physics which are properties of being, and exist completely independently of what I think about them, or whether or not I perceive them. Berkeley’s subjective idealism reduces being to mind alone, and fails to account for the ontological first principles of objective external reality.

Works Cited

Aquinas, Thomas. The Summa Theologica: 1. Great Books of the Western World. Vol. 17. Encyclopedia Britannica, Inc., 1999.

Aristotle. The Works of Aristotle: 1. Great Books of the Western World. Vol. 7. Encyclopedia Britannica, Inc., 1999.

Berkeley, George. The Principles of Human Knowledge. Great Books of the Western World. Vol. 55. Encyclopedia Britannica, Inc., 1999.

Whitehead, Alfred North. Science and the Modern World. Great Books of the Western World. Vol. 55. Encyclopedia Britannica, Inc., 1999.

1For Plato’s account of the slave-boy see Plato, Vol. 6, 180 – 184. Aristotle acknowledges that rational deduction is one part of knowing reality and affirms Plato’s account in his Posterior Analytics, Vol. 7, 97. Aristotle, however, fine tunes Plato’s argument and suggests that both rational deduction and inductive empirical observation are needed to come to a true and full understanding of reality.

2The principle of either/or is what makes logic gates and modern digital computing possible.