When you take charge of your mind, you take charge of your life.
When you understand your thoughts, feelings, emotions, and desires, you can direct them to any end you choose. Wisdom comes from taking the time to study yourself, to know why you are the person you are. Taking charge of your mind is a thoughtful, reflective, solitary process. Only you can come to understand the complex inner workings of your own mind, and you must be willing to spend the time and effort that gaining such insight requires.
Theoretical knowledge without practical experience might be compared to a large mass of undirected energy. Until it is focused, it is difficult to direct the energy to a useful end. Practical experience is the lens through which the energy of knowledge may be focused and directed toward activities that will provide the greatest benefit.
When you learn new concepts or have an idea that has not yet been tested, make it a practice to think through its application carefully before implementation. When you have considered the possibilities, and it still seems to be a good idea — get into action. The only way to get practical experience is to get to work executing your idea.