O children of man! Do ye know why We have created you from one clay, that no one should glorify himself over the other? Be ye ever mindful of how ye were created. Since We created you all from the same substance, ye must be as one soul, walking with the same feet, eating with one mouth, and living in one land, that ye may manifest with your being, and by your deeds and actions, the signs of unity and the spirit of oneness. This is My counsel to you, O people of light. Therefore follow it, that ye may attain the fruits of holiness from the Tree of Might and Power.
Bahá'u'lláh in The Hidden Words, Arabic #68