If you are not a runner, but for some reason decided to run a marathon, you probably would not go out and run one this weekend. Instead, you would prepare; you would train. Frankly, you would have to train, because no matter how hard you tried you would most likely fail. Trying will only get you so far. If you’re serious, you would enter into a life of training.
Training is required for more than just athletics. It’s necessary if you want to learn to play a musical instrument, speak a new language, or run a business. The point is that there is a huge difference between training to do something and trying to do something. If you want to be great, you will need to train to be great.