How Descartes got to 'I think, therefore I am'.
I am a thinking thing.
But what if anything can I know for certain?
I can't rely on my senses. They sometimes mislead me.
How can I be sure I'm not dreaming now?
But surely 2+ 3 = 5, even in a dream?
But what if a little demon is inside my mind and is controlling my thoughts, so that every time I add numbers together I make a basic error?
And if there's a little demon in my mind how can I be sure of anything? I can only doubt everything.
But every thought no matter however unreliable proves that I exist.
so, I think, therefore I am
COGITO ERGO SUM
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