God wants us to be united: unity is our purpose. This world was created for humanity to live peacefully together as one family. The Bahá’í ideal of world unity is based on the belief that it is God’s purpose for us to achieve unity.
Oneness - A Reality
The concept of the oneness of humanity is not merely sentimentalism or an expression of pious hope. It has profound implications for society. The teachings of the Bahá’í Faith describe how this spiritual principle should be translated into action in our lives.
Bahá'u'lláh taught the Oneness of humanity; that is to say, all the children of men are under the mercy of the Great God. They are the sons of one God; they are trained by God. He has placed the crown of humanity on the head of every one of the servants of God. Therefore all nations and peoples must consider themselves brethren. They are all descendants from Adam. They are the branches, leaves, flowers and fruits of One Tree. They are pearls from one shell. But the children of men are in need of education and civilization, and they require to be polished, till they become bright and shining.
(Abdu'l-Baha, Abdu'l-Baha in London, p. 28)