What was Socrates's main accomplishment?

* This whole thing helped me alot so do please read it. Socrates was one of the greatest philosphers of all time. He turned philosophy from the study of great philosophical questions to the study of man. He preffered to postulate on ethics rather than the meaning of the world. He used to go to the ancient Greek market ('agora'), talk to people and help them realize that they already knew the "truth", by examining their selfs. The "know thyself" motto is one of the most famous ones in philosophy. It is attributed to Socrates. Socrates also believed that the limits of human knowledge were such that prevented us from searching the ultimate truth for metaphysical problems. That is why he thought that postulating on human matters is what a true philosophers should do. He used to say that "The only thing I know is that I don't know nothing'' ("Εν οίδα ότι ουδέν οίδα" in Greek).