The Hidden Words of Bahá'u'lláh
Page 35
 

"38: O SON OF SPIRIT! Burst thy cage asunder, and even as the phoenix..."
 
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O SON OF SPIRIT! Burst thy cage asunder, and even as the phoenix of love soar into the firmament of holiness. Renounce thyself and, filled with the spirit of mercy, abide in the realm of celestial sanctity.