Common principles in every religion, love, wisdom and unity.
They are the means to avoid errors, take the path of growth and the realization, and respond to urgent and vital questions that inevitably beset us.
For all religions, the golden rule is the highest expression of spiritual thought. The founders of each one of the largest in the world - including Jesus, Buddha, Confucius and Muhammad - religions taught to obey the golden rule is the strongest form of that humanity realize their most cherished idea.
Do you want to do with you, because that is the law and thus speak the prophets to others. Christianity
Do not do another thing which is bad for you. This is the essence of the entire Torah; the rest is just comment. Judaism
Do all the other men what quisierais made with you; and rechazad for others what rechazaríais for you. Islam
Not always to another with things that will hurt you. Buddhism
Tzu-Kung asked: "Are there some principle upon which to base life?" The master replied: "No is perhaps the reciprocity that principle?" "-not present to others what they don't want for you". Confucianism
This is the sum of the real virtue: try others as want to be treated. Do not do to others what do not want that he made with you then. Hinduism
Unit and wisdom, common beginning as I said initially.