Let me explain in terms of the martial arts. As a beginner you know nothing of stance or sword position, so you have nothing in yourself to dwell on mentally. If someone strikes at you, you just fight, without thinking of anything. Then when you learn various things like stance, how to wield a sword, where to place the attention, and so on, your mind lingers on various points, so you find yourself all tangled up when you try to strike. But if you practise day after day and month after month, eventually stance and swordplay don't hang on your mind any more, and you are like a beginner who knows nothing ... . The cogitating side of your brain will vanish and you will come to rest in a state where there is no concern. Takuan, 16th Century Japanese teacher, in explaining the shift from unconscious incompetence, through conscious incompetence and conscious competence, to unconscious competence.