The Worlds of God by -U.S.Baha'i National Ref Library Committee- 1 Para

"Man has two powers, and his development two aspects. One power is connected with the material world and by it he is capable of material advancement. The other power is spiritual and through its development his inner, potential nature is awakened. These powers are like two wings, both must be developed, for flight is impossible with one wing. Praise be to God! Material advancement has been evident in the world; but there is need of spiritual advancement in like proportion. We must strive unceasingly... to accomplish the development of the spiritual nature in man." (RofM 38) (48:7)

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