The Hidden Words of Bahá'u'lláh
Page 47
 

"72: O MY SERVANT! Thou art even as a finely tempered sword concealed..."
 
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O MY SERVANT! Thou art even as a finely tempered sword concealed in the darkness of its sheath and its value hidden from the artificer's knowledge. Wherefore come forth from the sheath of self and desire that thy worth may be made resplendent and manifest unto all the world.