Baha'i World Faith Sect 2 by -'Abdu'l-Bahá- 1 Para

Look at this mineral: however far it may evolve, it only evolves in its own condition; you cannot bring the crystal to a state where it can attain to sight: this is impossible. So the moon which is in the heavens, however far it might evolve, could never become a luminous sun; but in its own condition it has apogee and perigee. However far the disciples might progress, they could never become Christ. It is true that coal could become a diamond, but both are in the mineral condition and their component elements are the same. (331:1)

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