In my humble opinion, all of them are important because success falls into all those categories. Someone can have talent, but it does not mean that they will succeed. Someone can make a major effort, but it also does not mean they will succeed. Luck has a better chance of success, but still does not guarantee success. It is important to always use all those categories wisely when making business decisions so that one will receive the best results possible. If you ask me though, success is happiness. If those three categories cannot bring happiness, then the person has failed.
