The Golden Rule of Many Faiths

All over the world many different cultures have come up with codes for living, and beliefs for explaining how the world works. Many people call them religions. For the moment I'll call them Belief Systems.

Surpisingly enough, even with the vastness of the earth, there are a few prevailing similarities in all of these different Belief Systems. One of them being The Golden Rule.
Here are some examples:

• Christianity: All things what so ever ye would that men should do to you, do ye even so to them: for this is the Law of the Prophets.
  Matthew, 7.12
• Judaism: What is hateful to you, do not do to your fellowmen. That is the entire Law: all the rest is commentary.
  Talmud, Shabbat, 13a
• Bahmanism: This is the sum of duty: Do naught unto others which would cause you pain if done to you.
  Mahabharata, 5, 1517
• Confucianism: Surely it is the maxim of loving-kindness: Do not unto others that you would not have them to do unto you.
  Analects, 15, 23
• Taoism: Regard your neighbor's gain as your own gain, and your neighbor's loss as your own loss.
  T'ai Shang Kan Yin P'ien
• Zoroastrianism: That nature alone is good which refrains from doing unto another whatsoever is not good for itself.
  Dadistan-I-diniki, 94, 5
• Islam: No one of you is a believer until he desires for his brother what he desires for himself.
  Sunnah