I have the greatest desire to speak with you, but if I do not talk with my tongue I commune with my heart and my soul is with you. Without the medium of words it speaks to you of mysteries. Those who understand can converse with me thus for night and day I cry, “Yá Bahá El-Bahá,” and I proclaim the kingdom of BAHA‘O‘LLAH so that intelligent hearts can understand the significance. Those turned toward the kingdom perceive the light of BAHA‘O‘LLAH; but if they are not turned, even should I address them in eloquent and resonant words, it would be like playing a marvelous instrument for the deaf. Thanks be to God, your hearts and intelligence are awakened, so that you hear the divine mention night and day, I hope that you understand what I say, that you comprehend the praises of BAHA‘O‘LLAH, for I have no aim save to proclaim the kingdom of El-Bahá; I have no occupation save to explain the book of BAHA‘O‘LLAH. My hope in you is great, that the song may penetrate.
(‘Abdu’l-Bahá, Divine Philosophy, p. 119-120)
Purify your ears that they may hearken unto the Voice of God.
(Bahá’u’lláh, The Proclamation of Bahá’u’lláh, p. 74)