Descartes argues against trusting the senses on the grounds that
a. Sense perception is indubitable
b. They sometimes deceive him
c. God allows sensory deception
d. They never directly deceive him
The Correct Answer and Explanation is:
The correct answer is b. They sometimes deceive him.
Explanation:
René Descartes, a 17th-century French philosopher, is renowned for his method of doubt, which he employs to establish a foundation for knowledge that is absolutely certain. In his philosophical inquiries, particularly in “Meditations on First Philosophy,” Descartes raises concerns about the reliability of sensory perception. He argues that the senses can often lead us astray and that they are not always trustworthy sources of information about the external world.
Descartes begins by reflecting on experiences where his senses have deceived him. For instance, he points out that we sometimes perceive distant objects as smaller than they are or may mistake a stick partially submerged in water for being bent. Such examples highlight that sense perception is not infallible and can be misleading, thus providing grounds for skepticism. This recognition leads Descartes to assert that we should not place complete trust in the senses, as they can lead us to false conclusions about reality.
Furthermore, Descartes introduces the notion of a “malicious demon” or an evil genius—a hypothetical being that could manipulate our perceptions and cause us to believe in a reality that is fundamentally deceptive. This radical doubt serves to illustrate the vulnerability of our sensory experiences to deception. Since our senses can sometimes mislead us, Descartes concludes that they cannot be entirely trusted as a basis for knowledge.
In essence, Descartes argues that since sensory experiences can sometimes deceive, we must seek a more stable foundation for knowledge—one that does not rely solely on the fallible nature of the senses. This line of reasoning ultimately leads him to the famous conclusion, “Cogito, ergo sum” (“I think, therefore I am”), where he establishes the certainty of his own existence as a thinking being as the starting point for all knowledge.