>>11091139I think that human beings are the perfect symbiotic creatures for ideas, and I think those ideas have certainly led man into self-sacrificing ventures. If the idea was not greater than the man, why do we sacrifice ourselves for? If Protogoras thinks that man is the ultimate source of value, then I think he's wrong. "Unchanging moral law" is synonymous with non-human principles. Since everything human experiences a cycle of birth, and death, everything that does not, would not. In other words, this is a non-human principle. And I believe that there are principles which are greater than man. Gathering at exactly what they are, is a bit of a different story.