Sophie receives a letter from the philosopher, who reveals his name as Alberto Knox, declining her invitation with regrets. Sophie also learns that the reason some letters are wet with two holes in them is that they are brought by Knox’s dog, Hermes.
The next lesson concerns Socrates. Before Socrates, a group called the Sophists taught philosophy for money. Protagoras taught that "Man is the measure of all things," meaning that a thing is good or bad only in relation to a person’s needs. They did not believe in absolute norms for what is right or wrong.
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