Descartes’ “I think, therefore I am” is probably one of the most famous lines in the history of Western ideas. Convinced of the need to “doubt everything”, he wanted to find one thing we could be absolutely sure of. It couldn’t be anything relayed by the senses: they were unreliable, full of bias, subjective. The one thing we could know for sure was that we were thinking beings. Thinking, then, was the “realest” thing about the human experience.