ETERNAL LAW: comes from God's nature as the Creator. As God is the Creator of everything that is, the universe and nature inevitably reflect the principles of the natural and moral order which existed before creation, as a 'blueprint' in the mind of God.
humans must, therefore, live a life based on that order, which is objective and absolute and applies to all, because God's blueprint for humans means that we all share a 'common human nature'. What is right for one person must be right for everyone else, no exception