Human voice has a “connection with spiritual realities”

In the world of existence physical things have a connection with spiritual realities. One of these things is the voice, which connects itself with the spirit; and the spirit can be uplifted by this means -- for though it is a physical thing, it is one of the material, natural organizations -- therefore, it is effective. ('Abdu'l-Bahá's words to Mrs. Mary L. Lucas, as quoted in "A Brief Account of My Visit to Acca", Chicago Bahá'í Publishing Society, 1905, pp. 11-14; The Compilation of Compilations vol II, pp. 78) (To read the entire talk please visit Talks of ‘Abdu’l-Baha)