"Human brotherhood and dependence exist because mutual helpfulness and cooperation are the two necessary principles underlying human welfare. This is the physical (material) relationship of mankind. There is another brotherhood, the spiritual, which is higher, holier and superior to all others. It is heavenly; it emanates from the breaths of the Holy Spirit...; it is founded upon spiritual susceptibilities. This brotherhood is established by the manifestations of the Holy One." Promulgation of Universal Peace Page 145 . (70:4)

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The Worlds of God
U.S.Baha'i National Ref Library Committee