"There is still another power which is differentiated from that of the soul and mind" (though the soul has access to it). "This... power is the spirit which is an emanation from the divine Bestower..., the spirit of faith, the spirit... Christ refers to when He says, 'Those that are born of flesh are flesh, and those that are born of the spirit are spirit.'" Faith "is the axis round which the eternal life revolves." (RofM 17 '56 Ed) (40:4)

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