All the people under heaven are as close as one family. “All under heaven” here refers to all the people both in a country and in the whole world. True love transcends blood ties and territorial boundary. This term is akin to such expressions as “universal love” and “all are brothers within the four seas.” True love also transcends humankind and extends to everything in the world, as expressed in such phrases as “one should be kind to people and love things” and “you should consider all people as your kin, and all things as your own kind.” The term demonstrates the Chinese vision of caring and compassion for all.

Now that our two countries are at peace and all under heaven are as close as one family, how can we continue to treat each other as outsiders? The History of the Northern Qi Dynasty

To love everyone and everything means to be broad-minded, kind, and benevolent... People in ancient times treated all under heaven as of one family, so all countrymen were united as one. This is not something imagined by later generations, but a true reflection of the broad-mindedness of the ancient people. Huang Zongxi: Commentaries on Writings of Famous Scholars of the Ming Dynasty