Sathya Sai Baba says “Practice 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.” – Sathya Sai Speaks Vol.10/Ch.4 – http://sssbpt.info/ssspeaks/volume10/sss10-04.pdf
Silence Develops Love
“Silence is the only language of the realised. Practise moderation in speech. That will help you in many ways. It will develop love, for most misunderstandings and factions arise out of carelessly spoken words. When the foot slips, the wound can be healed; but when the tongue slips, the wound it causes in the heart of another will fester for life.
The tongue is liable for four big errors: uttering falsehood, scandalising, finding fault with others, and excessive articulation. These have to be avoided if there is to be peace for the individual as well as for society. The bond of brotherhood will be tightened if people speak less and speak sweetly. That is why silence was prescribed as a vow for spiritual aspirants by the scriptures. You are all spiritual aspirants at various stages of the road, and so this discipline is valuable for you also.” – Sathya Sai Speaks, Volume I, Chapter 10: Viveka and Vairagya.