From now on, it will be the beginning of its existence. It comes from "You Ji", an article in "The Book of Songs·Lu Song". It means "Enjoy peace from now on and have good harvests every year."
Old Fuding of Changle Wuji said: If you can stay happy forever, you will be able to rejuvenate.
Meaning after the merger: From now on, there will be good harvests every year, and you will have no worries about food and clothing. If you are content and happy, you can be young again.