What does the lack of blessings mean?

Seeking inadequacy and cherishing happiness means that you don't have to insist on perfection, but cherishing happiness means that you should be satisfied with everything. This sentence comes from Zeng Guopan. The original sentence is "looking for a lack of happiness, the flowers are not full and the moon is not round", which means that after the spring breeze is proud, there will often be unexpected disasters. Zeng Guofan, whose original name was Zicheng, the word Bohan and the name Sheng Di, was born in the seventieth grandson of Saint Ceng Zi. He was a politician, strategist, philosopher, writer, calligrapher, founder and commander-in-chief of Xiang Army in China in the late Qing Dynasty. His rise had a far-reaching impact on the politics, military, culture and economy of the Qing Dynasty.