The Dreaming Hypothesis
Descartes realized that when he is in the state of having a Dream, he has a perception, at that moment he all of his senses are being deceived as everything in that world of dreams are indistinguishable to the world of reality.
Premise 1: We can't always tell when we are dreaming.
Premise 2: if we can't tell that we are dreaming, we can't be certain that we are dreaming right now.
Premise 3: If we cannot be certain that we are not dreaming right now, then we cannot know anything about the world of reality.
Conclusion: We can't know anything about the world of reality.
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Summary of Meditation I. Of the things which may be brought within the sphere of the doubtful.
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