Bottom line: thousands of books, the head of the family.
Couplets originated from a folk story.
According to legend, Jie Jin was a famous person in the Ming Dynasty, and there was a bamboo forest in front of his house. On New Year's Eve, he posted a pair of Spring Festival couplets on the door: The door faces a thousand bamboos, and the family lives in thousands of books. The owner of the bamboo forest is a local rich man. He saw it and wanted to embarrass Xie Jin, so he had the bamboo cut down. Jie Jin understood what he meant, so he added a word to the couplet, which read: The door is as short as a thousand bamboos, and the house is as long as thousands of books. The rich man was even more annoyed when he saw it and ordered the bamboo to be uprooted. Jie Jin chuckled and added another sentence to the couplet: The door is short of thousands of bamboos, but the family keeps thousands of books. The rich finally bowed their heads and gave up.
This story not only shows Xie Jin's disapproval of wealth and integrity, but also shows his superb literary level and writing control ability. It is rare for couplets to express their meaning and confront the rich man while maintaining neatness and standardization.