Practice moderation in speech.  That will help you in many ways.  It will develop Prema (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 to four big errors - uttering falsehood, scandalising, finding fault with others, and excessive articulation.  These have to be avoided if there has to be Shanthi (Peace) for the individual as well as for the society.  The bond of brotherhood will be tightened if people speak less and speak sweet.  You are all spiritual aspirants at various stages of the road and mounam (Silence) as a discipline will be valuable for you.

-Sri Sathya Sai Speaks, Vol 1 Ch 10, July 22, 1958.

"Silence is the language of the realised soul". - Baba