The greatest discovery of all time is Posted on August 11, 2018August 11, 2005 by admin “The greatest discovery of all time is that a person can change his future by merely changing his attitude.” — Oprah Winfrey Author: Oprah Winfrey Category: time Tags: time, Oprah Winfrey Spread the love Related posts: Do the one thing you think you One-fifth of the people are against everything You begin saving the world by saving Little minds have little worries, big minds