"treat others as u would like to be treated"
A very good quote.
But in my opinion this doesn't help much in getting to a universal standard without making many clarification and distinctions.
We discussed earlier, and as you mentioned again, every one likes to be "good" but definition of "good" is different in different minds, making it a very relative and subjective term. We also have tendency to compartmantalize our consciousness in order to remain "good".
In the same way treating 'others as you would like to be treated' in my opinion is more a relative and subjective issue and can't be taken as a general standard.
Take Taliban for example. In their opinion its "good" for themselves and for other people to create an Islamic society, even by use of force if required. Its good for them to have long beard and for others too. But others might not agree to this definition of "goodness" of them.
American don't like communism for itself and for any other country. Thats why it invaded Vietnam and drop bombs on civilian people to save those people from the "evil" of Communism.
So the above standard is so generalized that it can't be applied without making many clarifications and distinctions. Even I don't think human can agree to any universal standard for "good".
People try to find number system, scientific theories, predictions in Quran. It might contain them. But I don't think this is what the purpose of Quran is. Because people through their Intellect which is endowed by their Creator can reach to these knowledge by themselves and they have!!
I truly believe that it is only God sent people and book that can make this standard of "good" and "justice" for us.
Humans have made incredible advancements in the fields of science and technology. Through their Intellect they are able to advance their history from "primitive" cultures to modern global cultures. They have added much sophistication and luxury in their way of living.
But humans have done proportionally nothing in becoming a "human". They have not yet been able to subjugate their low nature and desires such as oppression, greediness, selfishness and as Will Durant says they have just change their means.
I was watching a scene in Gladiator in which people were shown enjoying the brutal fighting(if you can recall that scence), Will Durant's above comment popped up into my mind at that time. Don't you really think, people have just changed the means in our living patterns, now thy consider themselves to be more "civilized" but we enjoy the same brutality watching wrestling, soccer. Bristish colonist enjoyed killing of Natives( the "inferior" race),Germans enjoyed killing Jews, Americans took pride in their democracy dropping bombs in Nacaragua.
The absence of this evolution of Humanity in humans has made some philosophers of history believe that human history is moving towards self-destruction.
Were it not flashes of lights in history, I think human civilization have had destroyed itself much earlier. Thats why we need Prophets and message of God.