Modest calligraphy

Tian Yingzhang's calligraphy collection. The sentence "Ignorance is often complacent, knowledge is not frivolous" means that people without knowledge tend to be more complacent and look down on others, while people with knowledge and insight are not frivolous, but more modest. The source of this sentence is Tian Yingzhang Calligraphy Collection, which is a famous saying used by Mr. Tian Yingzhang to warn himself to be modest and prudent, guard against arrogance and rashness.