“Practise silence, for the voice of God can be heard in the region of your heart only when the tongue and the inner storm are stilled, and the waves (of the mind) are calmed. There will be no temptation for others to shout when you talk to them in whispers. Set the level of the tone yourself: as low as possible, as high as necessary to reach the outermost boundary of the circle you are addressing. Conserve sound, since it is the treasure of the element ether (Akasa), an emanation from God Himself. Reason can prevail only when the arguments are advanced without the whipping up of sound. Silence is the speech of the spiritual seeker. Soft speech is the expression of genuine love. Hate screeches; fear squeals; conceit trumpets; but love sings lullabies, it soothes, it applies balm. Practise the vocabulary of love; unlearn the language of hate and contempt.”
"Divine Discourse" (19 February 1970)
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Sathya Sai Baba 33
Indian guru 1926–2011Related quotes

A variant of part of this statement is often quoted: Just because your voice reaches halfway around the world doesn't mean you are wiser than when it reached only to the end of the bar.
RTNDA Convention Speech (1958)
Context: I have no technical advice or counsel to offer those of you who labor in this vineyard, the one that produces words and pictures. You will, I am sure, forgive me for not telling you that instruments with which you work are miraculous, that your responsibility is unprecedented or that your aspirations are frequently frustrated. It is not necessary to remind you of the fact that your voice, amplified to the degree where it reaches from one end of the country to the other, does not confer upon you greater wisdom than when your voice reached only from one end of the bar to the other. All of these things you know.

Amacher, 1999, cited in: Franziska Schroeder (2006). Bodily instruments and instrumental bodies. Vol. 25. p. 74:
Description of how "ears act as instruments and emit sounds as well as receive them (Amacher, 1999)... [and] the way these 'otoacoustic emissions' might function."

“Before you speak, it is necessary for you to listen, for God speaks in the silence of the heart. ”

165
Silence Speaks, from the chalkboard of Baba Hari Dass, 1977

Collected Works, Vol. 31.
Collected Works