Study hard and think quietly: It means study hard and think quietly.
Word analysis: diligence is diligence and hard work; Learning is learning; Quiet means quiet; Thinking is thinking. These four words tell us not only to study new knowledge hard, but also to think and summarize after learning. As Confucius said, learning without thinking is useless, thinking without learning is dangerous, and combining learning with thinking can get twice the result with half the effort.
Lishu: Also called Han Li, it is a solemn font commonly used in Chinese characters. Its writing effect is slightly wide and flat, and the horizontal painting is long and the vertical painting is short, showing a rectangle, paying attention to "silkworm head and goose tail" and "twists and turns". Lishu originated in the Qin Dynasty and was compiled by Cheng Miao. It reached its peak in the Eastern Han Dynasty, which had a great influence on later calligraphy. Calligraphy is called "Tang Kai of Han Li".