Teach thou the Cause of God with an utterance which will cause the bushes to be enkindled, and the call 'Verily, there is no God but Me, the Almighty, the Unconstrained' to be raised therefrom. Say: Human utterance is an essence which aspireth to exert its influence and needeth moderation. As to its influence, this is conditional upon refinement which in turn is dependent upon hearts which are detached and pure. As to its moderation, this hath to be combined with tact and wisdom as prescribed in the Holy Scriptures and Tablets. Meditate upon that which hath streamed forth from the heaven of the Will of thy Lord, He Who is the Source of all grace, that thou mayest grasp the intended meaning which is enshrined in the sacred depths of the Holy Writings.
(Baha'u'llah, Tablets of Baha'u'llah, revealed after the Kitab-i-Aqdas)
