Meaning: That I am able to wonder whether I exist, proves that I do exist. (by
René Descartes)
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The proof seems sufficient but not necessary. I still am even when I'm not
thinking.
In fact, what we often do is OVER-thinking, a modern pandemic (according to
Eckhart Tolle).
One story impressed me years ago with a remark that kids in India were taught
meditation to counter mental stress and anxiety (read fear-driven repetitive
over-thinking) in their quest, in a fierce competition, for academic excellence
and a better future.