1. Wise people have different ideas. They advocate relativism and skepticism, believe that things and truth and falsehood are transferred by personal feelings, and describe personal wishes and demands as the decisive force to produce social, political, legal systems and moral norms. They are keen on the superficial persuasiveness of language and logic, which is the dross of wise men's thoughts and is bound to fall into subjective idealism in their understanding. The late wise man developed this idea and was obsessed with playing with concepts and word games. Later, these thoughts had a negative impact in history and became the source of skepticism. From the middle of 4th century BC to the beginning of 3rd century BC, the Greek philosopher Pyrrho tried his best to exaggerate the relativism of wise men and went to extreme skepticism.

2. protagoras developed empedocles's thought that perceptual things are a mixture of opposites, and further proposed that every problem has opposing aspects.

They think that the political and legal system and moral norms are neither natural nor created by God's will. They are formed in the long-term life of human beings, and they are the established products formed by people in order to avoid being destroyed in cannibalism.

4. In order to oppose the bondage of traditional ideas and religious myths, they tried to belittle the authority of God and deny the traditional image of God.