o be under God means to be under His authority. It's much like being a child, and being under the authority of good parents. The child that is under the authority of a good parent is happy to be under that authority. It pleases that child to make his/her parent happy. This child, who is brought up in a loving home doesn't despise discipline, but knows that when they've erred in they ways, that their punishment is deserved and they accept that fact. When the children of a family are obedient to their parents they live in harmony with each other. Sure, there might be sibling rivalry, but each individual realizes that they are interdependent on each other and that if one hurts, the others hurt.