Eli5: What does ‘I think therefore I am’ mean and why is it a big deal?
In: Culture
Has your brain ever lied to you? It probably has; between sensory illusions, deja vu, hallucinations, dreams, false memories, etc., our perception of what is real is very suspect; your mind plays tricks on you. Descartes basically said that the only thing you can know with any real certainty is that you exist, and you know that because you are the one thinking about existing.
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