Human utterance

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.

Bahá’u’lláh 
LAWḤ-I-HIKMAT (Tablet of Wisdom) P.144