The difference between success and failure in any venture often cannot be attributed to a single incident or cause. It’s usually a culmination of factors including timing, execution, assumptions, economic factors, and more. While much has been written on the success of start ups, one factor usually sticks out in my mind. Recently a friend who is in the process of starting a business told me he was “overwhelmed and not sure of what he was doing.” I can relate to that feeling well. But my advice to him still rings true from the early days of my company, The A Group. My words of encouragement were simple: “Don’t quit. Success is 90% perseverance.” I can’t quantify the percentage. But I know that the great majority of the successes I have seen in my professional career both in business as well as in ministry have been directly tied to my…