There was really only man and that man was the measure of all things and Socrates kind of disagrees with that. He believes there's a universal truth. Now the story is there is an oracle at Delphi that informs one of Socrates' friends to tell him that he's the smartest dude of the land and Socrates is like there's no way I'm the smartest guy. So he starts going around to the leaders and to the important people of Athens to kind of question them about what they know about life and he's figuring he'll find out that there's got to be someone smarter than him and he starts doing what's called the Socratic method. He starts asking these people questions when they tell them things that he knows and he starts to find out through this Socratic method that these dudes really don't know what they're talking about. So he ends up figuring out that he is the smartest person not because he knows anything but that he knows that he really doesn't know anything. Two of the more famous quotes that are attributed to Socrates really sum him up and they are an unexamined life is not worth living.