Descartes Rationalism

     On the journey to find truth to base all thought upon, Descartes explains his first step in doing so. “Never accept anything for true which I did not clearly know to be such; that is to say, carefully to avoid precipitancy and prejudice, and to comprise nothing more in my judgment than what was presented to my mind so clearly and distinctly as to exclude all ground of doubt.”(Kolak, Pg.228). Assuming that everything you see is fictitious, Descartes believed he had no senses at all; “body, shape, extension, motion, and place are unreal.”(Weissman, Pg.23). Our senses have failed us all at one point or another in our lives, so why use the senses as a base for thought? The most famous quote and philosophy by Descartes in history ever, “Je pense, donc je suis, cogito ergo sum” (Durant, Pg.639). “I think, therefore I am” was the first step towards a basis to understand truth, and leaning away from truth through the senses.

Locke’s states that “All knowledge comes from the senses through experience” interpreted when Locke’s “blank slate” idea to when we are kids we know nothing. Our brains have to make connections to things and these connections are gained through experience and continues

In Descartes Objection and Replies the idea of knowledge, how it is gained and defined, and the idea of true intellect are discussed. Through the use of the wax experiment true intellect is found, defined, and explained. With this being said he wanted to demonstrate how none of the truths we found through basic perceptive tools or senses can be relied upon and that you had to utilize deep though or knowledge to know how something is defined or even if it exists.

In Descartes’ Dream Argument, he doubts his own senses by comparing real life to a vivid dream. Sometimes a dream may be so vivid that it feels like it is real life. So then, it is entirely possible that what one is experiencing in “real life” may actually be a dream or a figment of one’s imagination. Therefore, it must

In Rene Descartes’ Discourse on Method he expresses his disappointment with traditional philosophy and with the limitations of theology; only logic, geometry and algebra hold his respect, because of the utter certainty which they can offer us. Unfortunately, because they depend on hypotheses, they cannot tell us what is real, i.e. what the world is really like. Therefore Descartes suggests a method of thought combining the consistency of mathematics but based on natural truths about what is real, basic knowledge which could not be wrong (like the axioms of geometry). He calls into question everything that he thinks he has learned through his senses but rests his entire system on the one truth that he cannot doubt, namely, the reality of his own mind and the radical difference between the mental and the physical aspects of the world.

Primary qualities, however, are objective and include aspects such as an object’s height and weight (Paquette 212). Through this, Locke claimed that the existence of objects can be made certain due to the primary qualities it possesses (Paquette 212). Similar to Descartes, Locke believed in a sense of existence. However, in his view, the facts from the primary qualities proved the object exists because the object exists within itself (Paquette 212).

Like Descartes, Locke also believed in an external world. As an empiricist, Locke relied heavily on the senses to provide true knowledge (Moore 2002). He shared Aristotle’s belief that the mind is a blank slate, also known as tabula rasa, at birth (Paquette 211). Our sense experiences thereafter provide us with knowledge to fill in those slates (Paquette 211). In Locke’s “Representative Theory of Perception,” also known as Epistemological Dualism, he stated that material objects exist and are separate entities from human beings (Paquette 227). However, he also believed that objects exist in the mind as psychological entities (Paquette 227). Locke concluded that people can taste, smell, touch, and see the external world which, in turn, becomes impressions in our minds (Paquette 227). Descartes and Locke are thus seen to be similar in the sense that they both believed in an external world.

Locke discards the suggestion of innate ideas. Locke believes that if we always had innate ideas, it would be impossible for us not to perceive or be aware of them. He believes that if there were innate ideas then they would be universal ideas present

He finds it plausible that we are all living in a dream and we have never experienced reality. He can no longer give any credence to his senses and finds himself in a place of complete uncertainty. Descartes comes to the conclusion that nothing can be perceived more easily and more evidently than his own mind. He has discovered that even bodies are not accurately perceived by the senses or the faculty of imagination, and are only accurately being perceived by the intellect. He also realizes that they are not distinguished through being touched, smelled, or tasted, but by being understood alone. (An apple is an apple because our mind tells us that it is an apple.) It is the faculty of reason that gives the knowledge and lets the mind know the truths and essences of objects. Descartes assumes that all of us can be decided by our senses, someone can see something far away, and then discover that is not what we thought it was. Or even a oar when is immerse half in water attempt to be bent, but instead is straight. Descartes think that we cannot always be sure of what we sense, and gives the example of himself seated by the fire.

The Method of Doubt used by Descartes is the claim that the mind comes to more certain conclusion than the senses. Descartes concentrates on the idea that we have to be absolutely certain of something before we can say we know it. For Descartes, truth has to be certain and unshakable. If there are any hint of doubt in our minds, things that we claim to know might be false, then we have to say we do not know it. Descartes takes absolute certainty as the most important characteristics of genuine knowledge. The only way to find knowledge is to doubt everything that suggest itself as true. Whatever survives the period of such intense questioning must be certain.

All ideas we experience derive from sensations and perception. Sensation obviously uses the bodily senses to receive ideas, whereas reflection uses the body’s own procedures to receive ideas like thinking, believing and doubting. [4] Both of these processes are passive. The corpuscular hypothesis, which Locke expanded on from Boyle’s original thoughts, seems to suggest that everything in existence are colourless, tasteless, soundless and odourless corpuscles of matter. By looking at the bits of matter and their motions, it is possible for us to explain the sensations we gain from primary and secondary

So, having claimed that he could account for all knowledge purely in terms of “experience” and having arrived at the concept that had dominated philosophy for the last several generations, Locke proclaimed it a mystery and even joked about it. (LOOKING AT PHILOSOPHY- pg.165-174).

Descartes’s theory of knowledge is essentially based in skepticism. He argued that in order to understand the world, first a person has to completely suspend their judgements of the world around them. This is the impression that the world makes on their mind. In this way, the physical world is not what leads to knowledge. Instead, the mind finds rationally seeks knowledge. The question is, essentially, “should we believe beyond the evidence?” (Kessler, 2013, p. 332). In this way, the ideas are rooted in the nature of doubt. This is an inherent nature of the mind, which is the result of the nature of man as made by God. In this way, the mind is guided by god towards knowledge in its infallible ability to reason about reality. In this way, the mind’s reasoning ability, even in the absence of physical reality, can ultimately lead to knowledge. I don’t fully agree with Descartes’ proposition that only the mind can produce certain knowledge and that our senses are constantly under the attack and being deceive by some evil deceiver. In order to go against Descartes propositions concerning about doubt I will use Locke to oppose it.

Rationalism – knowledge acquired using reasoning, using intuition and deduction to analyse how the person concluded and how they validate the argument or concepts presented.

Firstly, Descartes deals with the issue of empiricism- the theory that our knowledge is derived from our sensory experiences. Since we know from everyday errors that our senses have the ability to deceive us fairly often so making our perceptions to be something that it is not. For example, there are lots of examples of optical illusions and the fact that the train tracks may appear to converge from a distance. Consequently, we ought to