栄 (Ei) is flourish. 枯 (Ko) is wither. 盛 (Sei) is flourish. 衰 (Sui) is dicline.
-->Literaly means "Flourish, wither, flourish, dicline.
Explaining;
like flux and reflux of tides nothing can flourish forever, will wither someday, but would flourish again.
Today's Sakura Japanese Proverb is expressing the structure of the world. Prosperity and Declining repeat after each other. It can be referred to countries, products, even people. Like Britney Spears?
