Hippocrates was a contemporary of Plato and Socrates and lived on the Greek island of Cos.
Socrates was condemned for corrupting the youth of Athens by teaching individuality.
On one point, at least, Socrates was wrong: For some folks, the unexamined life is worth living.
"The thing Socrates was famous for is that you have to realize your own ignorance before you learn anything," he said.