Study hard and make progress every day. Who said that?

"Study hard and make progress every day" is an inscription by Mao Zedong for a primary school student.

It is said that this student's name is Chen Yongkang, and he comes from Suzhou, Jiangsu. 1951may 3 playing at the school gate, a young man gave him some money and a pack of yellow powder (which was found to be flammable and explosive after inspection) and asked him to put it on the teacher's desk. Chen Yongkang felt suspicious and shouted. The spy punched him. Although Chen Yongkang was covered in blood, he refused to let go, and the People's Liberation Army who arrived at the news subdued the spy. Chen Yongkang's heroic deeds soon spread in the local area, and the Suzhou Municipal Government also publicly praised him. Shortly after Chairman Mao learned of his deeds, he wrote an inscription "Study hard and make progress every day" and sent someone to make a banner for the children in Chen Yongkang. At the same time, he issued a call for "study hard and make progress every day" to teenagers all over the country.