Plato understood that you cannot legislate good behavior! The actual translation of the quote is "Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws." - Plato B.
Thales of Miletus was a pre-Socratic Greek philosopher from Miletus in Asia Minor, and one of the Seven Sages of Greece. Many, most notably Aristotle, regard him as the first philosopher in the Greek tradition.