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Before Descartes got himself dubbed the Father of Modern Philosophy, he was a career mathematician (credited with discovering the concept of Analytical Geometry) and a well-
renowned physicist. Add to that the fact that he was a devout Catholic living in fear of the Great Inquisitor's wrath due to his Galilean leanings, and you have a dude with some heavy issues. And that was
before he went all philosophical.
Descartes took radical skepticism to the max: he decided to doubt everything, and quickly discovered that this perched him on the precipice of madness. He was a Rationalist, meaning that you can know things without having to rely on sensory experience. Certain ideas are innate. But he suffered over the body-mind disconnection (dualism). Suffice it to say that the guy went through a lot of blood, sweat and tears before reaching his simple and elegant conclusion:
Cogito, ergo sum.
Blackie the Horse didn't seem to suffer from too much cogitating; for the better part of his life (28 years of his venerable 40), he stood in the same pasture, in the same spot, facing the same direction, masticating. I eat, therefore I am. There's a bronze statue erected in that very same spot now, honoring that venerable master of doing, basically, nothing... Maybe he was on to something. What do you think?