is not a famous saying of Mill.
Protagoras/ProTegla (referred to in the new high school textbook) (protagoras, about 49 or 48 BC ~ 42 or 41 BC)
Greek philosopher in the 5th century BC, the main representative of the school of the wise.
protagoras was born between 49 BC and 48 BC, and lived about 7 years. Born in the city of Abdallah, he came to Athens, the center of Greek slave-owner democracy at that time, became close friends with Perikles, a democratic politician, and worked out a code for Tully, an Athenian colony in southern Italy. Living in various places all his life, he was the most respected "wise man" at that time, receiving disciples to teach rhetoric and debate knowledge. It is said that in his later years, he was accused of "disrespect for gods", and his book On Gods was burned. I was expelled from Athens and died on my way across the sea to Sicily. All the works have been lost except a few fragments. His thoughts can only be seen in Plato's dialogues Tyatedes and protagoras.
Philosophical Thought
protagoras accepted Heraclitus' thought about the change of everything, and thought that the feeling phenomenon of change is real, and everything is constantly moving and changing. But he moved from this simple sensualism to relativism and skepticism. Asserting that everyone's feelings are reliable, people make different judgments on everything according to their own feelings, and there is no difference between true and false. Therefore, he put forward a famous proposition: "Man is the measure of all things", thinking that the existence of things is relative to people's feelings, and things are what people feel. The existence, nature and form of all things are relative, which depends entirely on people's subjective feelings. From this, it is concluded that "knowledge is feeling" and it is advocated that knowledge can be obtained by feeling. According to this view, he questioned the traditional religious theology: "As for gods, I don't know whether they exist or what they are like.". This emphasis on the significance of man as the subject of understanding objective things denies the role of supernatural forces such as God or fate in life and establishes human dignity. However, this kind of thinking ignores the role of law, which is not conducive to social stability. Later, Socrates proposed that "a man with thinking power is the measure of everything".
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