Epistemology: Rationalism, Empiricism, and the Limits of Human Knowledge
Foundations of Epistemology: The Nature of Knowledge
The Dual Origin of Knowledge
What is the origin of knowledge? The history of philosophy offers a dual response, derived from two primary sources: sensory perception and reason (thought).
- Reason: The first answer posits that knowledge originates from reason, resulting in the philosophical orientation known as Rationalism.
- Sensory Perception: The second answer asserts that knowledge originates from sensory perception (sense data), leading to the philosophical orientation known as Empiricism.
Limits and Possibility of Knowledge
How certain is our knowledge? What are its limits? There are three primary answers to this question, two being completely opposite, and one being an intermediate position:
- Skepticism: Denies the possibility of knowing anything, asserting that we cannot attain certain knowledge.
- Dogmatism: Defends the view that we can gain absolute and unlimited knowledge.
- Criticism: Holds that knowledge is possible, but it is not absolute. Therefore, knowledge must always be subjected to testing and scrutiny.
Rationalism: The Primacy of Reason
Philosophical Rationalism claims that true knowledge has a rational source, deriving exclusively from reason. Rationalists hold this belief because they think that reality itself has a rational nature—that reality is ordered and possesses a permanent, underlying structure.
The Rationalist View on Senses and Reason
For rationalists, reason constitutes the only complete body of knowledge, making the senses secondary. For some authors, the senses even hinder the process of knowing. They argue that we should isolate ourselves from sensory input and concentrate intellectually to discover truths already inherent in reason. This discovery process is purely intellectual, logical, and deductive.
Other rationalists assign an auxiliary role to the senses, meaning that sense data is subordinate to reason. They consider the senses secondary elements that can help reason, but which do not provide knowledge by themselves.
Why Reason is Superior to Other Faculties
Rationalists believe reason is the higher faculty of knowledge because it overcomes the limitations of other faculties:
- Superior to Sensory Perception: Sensory perception is too particular, whereas true knowledge must be universal.
- Superior to Feelings: Feelings are too subjective (private), whereas knowledge must be objective.
- Superior to Imagination: Imagination is too fantastic, and knowledge cannot be fantastic.
(Sensory perception is individual; feelings are subjective; imagination is fantastic.)
A Priori Knowledge and Innatism
To prevent reason from becoming disconnected from reality and lacking content, rationalists propose the existence of a priori knowledge. This is knowledge that is independent of, and prior to, experience. It is knowledge already present in our minds before any experience, and it is what makes experience possible and gives it direction.
The defense of a priori knowledge leads some authors to defend Innatism. This concept argues that certain ideas or knowledge exist in our minds from the moment we are born—they are present by nature, without requiring prior experience.