Those who know will not speak; those who speak do not know, can not know. It is the ignorant man who argues loudly and angrily and talks cynically. The wise man will pause before judging; he will see all sides of the problem, relate it to his own experience and hesitate to accept it or condemn it. He will hear less and taste more.
(From : Sai Veda, The Word of God, sayings of Bhagavan Sri Sathya Sai Baba)