René Descartes was once out to determine how to make things right and how to know whether they are right or wrong. In his experiment Descartes decided to use the following two mediations. He decided that he should not examine his beliefs as this might take longer due to the extended nature of the brain and therefore he decided that he should only examine the basis of the beliefs themselves, for example whether he trusted his sensory beliefs, physics, mathematics, global belief and the rest. ii. In his second mediation, Descartes decided to reject the slightest possibility that a belief was false and decided not to throw away the suspected false belief but to use it as a candidate for knowledge. Having concluded his mediations, this great thinker decided to apply his two methods using the following three ways.a) Descartes believed that sometimes human senses are deceptive. It is true that at certain times our senses can deceive us. For example, we may find ourselves looking for something small that is very close to us at a very distant distance. Also, a tall building from a long distance always seems very small but in reality the building does not change its size but the sense of our eyes does. Descartes also uses the example of refraction in physics. He argues that our senses lie to us in the sense that if a stick or ruler is placed in water they appear bent but in reality the stick or ruler is straight. Descartes also claims that this is the basis of hallucinations and for this reason our senses produce many deceptions. Take the example of staring too hard at the sun and then looking at the object. It is usually true that the color of objects is usually obscured by your senses, but later, when you realize the...... middle of the paper... to its criteria of knowledge which is infallibility. In this criterion Descartes argues that if you are wrong about something once there is a great chance that you might be wrong the next time, so we cannot rely on you knowing that particular piece of information. Having applied these three methods of doubt, Descartes created a conclusion which, I think, is therefore translated into Greek as Cogito ego sum. According to Descartes, a thinking thing implies doubt, understanding, affirmation, denial, will, reluctance and this also includes images that have sensory perceptions (René Descartes). Descartes further concludes by saying that a demon will only deceive something if it is there and therefore the thing must exist. Works Cited René Descartes. Meditations on Early Philosophy, Third Edition, translated by Donald A. Cress. London: Pearson, 2005.