Everyone knows that our life and our personal experience are the best teachers we could ever learn from. Of course, we often have to pay a truly high price for their lessons, but the knowledge we gain from them is almost impossible to be forgotten. However, it's always nice to accumulate such knowledge from the others and use their mistakes in order to reduce the number of your personal ones. So listen to these awesome people giving some positive advice to their younger selves and... who knows? Perhaps their words are exactly what you need to hear right now!