Obstacles are necessary for success because in Posted on August 21, 2015August 21, 2010 by admin “Obstacles are necessary for success because in selling, as in all careers of importance, victory comes only after many struggles and countless defeats.” — Og Mandino Author: Og Mandino Category: success Tags: success, Og Mandino Spread the love Related posts: Sound character provides the power with which Belief in oneself is one of the Man needs his difficulties because they are Flaming enthusiasm, backed up by horse sense