"If I speak forth, many a mind will shatter, And if I write, many a pen will break."

"O thou dear one! Impoverish thyself, that thou mayest enter the high court of riches; and humble thy body, that thou mayest drink from the river of glory, and attain to the full meaning of the poems whereof thou hadst asked.

Thus it hath been made clear that these stages depend on the vision of the wayfarer. In every city he will behold a world, in every Valley reach a spring, in every meadow hear a song. But the falcon of the mystic heaven hath many a wondrous carol of the spirit in His breast, and the Persian bird keepeth in His soul many a sweet Arab melody; yet these are hidden, and hidden shall remain.

   
    If I speak forth, many a mind will shatter,
    And if I write, many a pen will break. 20 , 21

Peace be upon him who concludeth this exalted journey and followeth the True One by the lights of guidance." ...

-Bahá'u'lláh, The Seven Valleys And the Four Valleys, pp. 28-29

20. The Mathnaví. 
21. This refers to Bahá’u’lláh Himself, Who had not yet declared His mission.