It is written in the Book of Rites: "When a person of noble character and integrity drinks in honor of another, one drink indicates solemn respect; two drinks show good manners and refinement of character; three drinks bring cheer and demonstrate a sense of propriety."
《禮記．玉藻》：君子飲酒，飲一杯表情肅穆恭敬，飲兩杯顯得溫雅有禮，飲三杯，心情愉快而知進退。