Plato

“We must realize that in each one of us there are two ruling and impelling principles whose guidance we follow, a desire for pleasure, which is innate, and an acquired conviction which causes us to aim at excellence.”

-- Plato, “Phaedrus”

Hmm, I don’t know. Does everyone really acquire that ‘excellence’ thing? Maybe, Plato, you should speak for yourself. Just the ‘pleasure’ one seems challenging enough for a lot of us, I dare say.