Think of each mistake that you have made in the past as homework. It was meant to prepare you for a big test. That test could be today, tomorrow, or any day in the future, but know that you are prepared. You have studied hard and learned your lessons!
Beautiful Post. I say Life is a classroom, there will be many teachers and lessons to learn. Always do your homework, because you will be graded. Good grades can determine your success and happiness, bad grades will add to your failure.