You want to become spiritual? Well, you should first know about the wild forces within you, which stand between you and your goal. You will have to work on those forces, just like all invested spiritualists. That means to know the essential knowledge about your human soul, and methods which forces those negative forces work for you, and not against you.
Our soul are meant to shine like a diamond. A soul through which spiritual light (wisdom) and spiritual heat (love) can go through. Without any knowledge of how your soul works, you may not know how to maintain its purity. In other words, can you keep a shirt white and clean for long without knowing how to avoid dirty hands and dirty places? No, then you will need to know those methods.