True, people should have at least idea of lossing in everything, it's important since it's a part of our character development and growth. We need to learn that we should at least make an effort and have efficient way to do things especially in gambling, if you don't want to lose then be precise and be analytical when it comes to betting. If you want to win, have some discipline and self-control in order to minimize losses. All of those things are in your hands and it's up to you on how you will control your fate. Luck is there and will occur when time comes but majority of the situation, if you can't control what's happening in you, then mistakes can happen.
Simply put, everyone who experiences defeat will easily learn to control themselves, because they have previous experience. Personally, I believe that everyone has different weaknesses and strengths, therefore everyone will have their own limits that are formed based on that experience. Self control can help increase the chances of winning, it will also help someone focus when analyzing the game. Many people experience continuous losses due to failing to control themselves, although sometimes experienced people also have the potential to act beyond the limit. Luck is preparation to meet opportunity, one thing that must be learned is self control.