The source is Feng Menglong's "Awakening the World and Constant Words Volume 18" in Ming Dynasty.
The topic is: people are happy and refreshed. When will the moon shine until the Mid-Autumn Festival? There are only these two sentences. The meaning of these two poems is that when people are happy, they are always full of energy and spring breeze, just like the moon is always bright and bright in the Mid-Autumn Festival. Later generations often use these two poems to describe that people are always at their best when they meet happy events.
And "quiet and leisurely" was added by later generations according to the poem.
Feng Menglong (1574- 1646) was a writer, thinker and dramatist in the Ming Dynasty. Words are still dragons, words are still children. Ming Reng Long, owner of Mohanzhai, three ancient songs, slave of Wuxia Ci, slave of Gusu Ci, known as Zhu in the former Zhou Dynasty in history. Han nationality, a native of Changzhou County (now Suzhou City, Jiangsu Province), came from a scholar-bureaucrat family. My brother dreamed of laurel trees and was good at drawing. Brother Meng Xiong, a big disciple, studied under Feng Menglong's Spring and Autumn Annals, and there are poems handed down from generation to generation. The three brothers are also called "Wuxia Sanfeng". His works emphasize feeling and behavior. The most famous works are Yu's Famous Words (also known as Ancient and Modern Novels), Shi Jing and Xingyan, which are collectively called Sanyan. Sanyan, together with Ling Mengchu's Surprise in One Moment and Surprise in Two Instances in Ming Dynasty, is a classic representative of China's vernacular short stories. Feng Menglong made a unique contribution to China literature by creating, collecting, sorting out and editing novels, operas, folk songs, jokes and other popular literature.