Best Answer: It's both simple and complicated. DeCartes lived in the time we call The Enlightenment, when the way people thought about a lot of things changed. The were disagreements over what was -real- and how we could determine what was reality and what was just our perceptions and our preconceptions.
DeCartes allowed that we could be wrong about anything. Anything we saw, anything we thought, could be wrong. It was very hard to prove anything for absolutely sure. 'Skepticism' was very popular in these days, the original meaning of skepticism being the believe that nothing can be known absolutely for sure.
But, DeCartes said, the fact that we THINK about them proves that we exist. That was the one thing that could be proven, and all arguments about reality had to stem from there.
Best Answer: It's both simple and complicated. DeCartes lived in the time we call The Enlightenment, when the way people thought about a lot of things changed. The were disagreements over what was -real- and how we could determine what was reality and what was just our perceptions and our preconceptions. DeCartes allowed that we could be wrong about anything. Anything we saw, anything we thought, could be wrong. It was very hard to prove anything for absolutely sure. 'Skepticism' was very popular in these days, the original meaning of skepticism being the believe that nothing can be known absolutely for sure. But, DeCartes said, the fact that we THINK about them proves that we exist. That was the one thing that could be proven, and all arguments about reality had to stem from there.
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