The welfare of the world depends on man's conduct and behavior. Man's conduct depends on his mind. The nature of the mind depends on thoughts. Only when man's thoughts are based on truth will the world flourish. One who aspires for the welfare of the world should see to it that his thoughts and actions are in accordance with his aspirations.
(From : Sai Veda, The Word of God, sayings of Bhagavan Sri Sathya Sai Baba)