Descartes viewed that many of our beliefs rest on shaky foundations. To find truth knowledge, we must doubt as much as we can find facts we cannot doubt.
Doubtable Facts
- I can doubt that my professor is my professor
- Could be an evil twin
- I can doubt that I am awake
- Could be in a vivid dream
- I can doubt that I have hands
- Could be in a coma
- I can doubt that I have a brain
- Could be that I am a soul and my perceptions are shaped by some soul world
- I can doubt that there is an external world
- I can doubt that I’m in pain
Undoubtable Facts
- I can’t doubt that I exist
- The very fact that I doubt shows that I have Consciousness which means I exist I Think Therefore I Am