This is one of my favorite quotes by Descartes, in which he argues that the existence of anything that you reason from your senses, like vision, can be essentially uncertain. Our reality could be a Matrix, or a simulation. We could never be 100% certain about anything. To illustrate, if you're looking at a tree, you don't know if that tree truly exists or if it is something you are creating in your dream. Likewise, if you’re viewing your reflection in a mirror, it doesn't mean that you exist. Therefore, you can always doubt the certainty of everything, BUT, even if life was an illusion, the fact that we question reality, proves that there's something thinking.
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