In a clean spot, fixing his seat firm, neither too high nor too low, made of the cushal grass, skin and cloth. Concentrating his mind, he should practice yoga for the purification of the mind. Akaki rahasis theta, by yourself, in solitary places, being established or staying there. Keeping your body mind under control, internally not grasping, not wanting, externally not accumulating. Now more practical instructions versus 11 onwards.