What is the single most important money management lesson or experience that had an impact on your life?

Please answer the following question by attaching your typed double spaced response. Essay answers should not be longer than four pages.
What is the single most important money management lesson or experience that had an impact on your life? What did you learn? If you could tell/teach your parent, sibling, friend, etc., an important money management tip, who would you choose and why? What would you tell them? Set a specific goal for yourself regarding money to accomplish by the end of the next school year. Explain the goal and detail how you are going to achieve it. (Use S.M.A.R.T. goal setting)