I think it is a realization that there is great personal benefit in ensuring the well being of others (people, animals, plants, fish, etc.). Some examples: our children benefit more when all children receive a quality education because they will need to work together in the future. Or that we need healthy trees and fish for a healthy climate, which in turn translate to our own health. Or that ensuring that everyone feels confident in the ability to have their needs met removes the need for revolt/revolution and provides peace for all of us, etc.