The Greek philosopher who advocated that people should "know thyself" was Socrates. The sages and sages of ancient Greece started from objective reality, observed life, and put forward many elaborations on human value that shine with the light of humanism. Socrates' thinking turned to human society, and the philosopher spent his life exploring issues such as the human soul, virtue, and happiness. He pointed out that the best way to obtain knowledge is systematic questions and answers; he proposed "know yourself". Only the pursuit of knowledge can produce virtue, and only rationality can produce dignity. "In this world, besides sunshine, air, water and smiles, what else do we need?" "Wisdom means knowing one's ignorance" "The more one knows, the less one knows" "People should know themselves" is Socrates' famous saying.