The best way to ensure that you remain flexible is to continually ask yourself, “Is there anything I am doing today that, knowing what I now know, I wouldn’t start up again if I had it to do over?” If your answer is, “No, I wouldn’t do it again,” then your next question is: “How do I change the situation or get out of it, and how fast?” You should be prepared to ask these questions whenever you experience resistance of any kind, in any area." Now, Build a Great Business! Brian Tracy, Mark Thompson, and Frances Hesselbein