"This is the reason why the sages do not wait for illnesses to appear, but take care of them before they appear..."
"To wait for the illness to develop before remedying it, for the disorder to form before taking care of it, is to wait until one is thirsty before digging the well, to wait for battle before forging the weapons. Is this not too late?"
"The Way! The sages practice it; fools admire it."
--The Yellow Emperor's Classic on Medicine (circa 2nd century BCE)