"Movement is essential to all existence. All material things progress to a certain point, then begin to decline. This is the law which governs the whole physical creation... Nothing that has life is without motion. All creation, whether of the mineral, vegetable or animal kingdom, is compelled to... either ascend or descend. But with the human soul, there is no decline. Its only movement is towards perfection; growth and progress alone constitute the motion of the soul." Paris Talks Page 89 (45:5)

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