The world is changed by your example, not by your opinion.
I can think of people who I would say exemplify the opposite of this and whose beliefs far out shadow their actions. Needless to say, I have little real faith and trust in them.
Paulo Coelho (b. 1947) is a Brazilian novelist most well-known for The Alchemist, first published in 1988. It has sold more than 65 million copies worldwide.