11. Spiritual development is about cleansing of the inner personality of the dirt of vasanas. For this you must develop an acute awareness of dirt, both external as well as internal. Begin with gross, external dirt present in the environment. Keep the environment neat and spotless. Then focus on the internal dirt of selfishness, ego and desire. Only a relatively pure and untainted mind is fit for meditation. Hence the emphasis on a clean surrounding.
Have a seat of your own that is neither too high nor too low. Just right to enable you to sit on it for long without any disturbance.
12 & 13. The mind and senses should be controlled before you embark on mediation. This is extremely important as the mind is unable to even concentrate, let alone meditate if there is no control.
The mind must be single-pointed. This is achieved by reducing desires by the practices of Karma, Bhakti and Jnana Yogas.
Practise yoga, union with Atman. Repeat the mantra of your choice, aloud in the beginning and reduce to mental whispers as you proceed.
All this is done for self-purification.
Then you see your reflection. You see it there but understand it within. The objective sadhana leads to a subjective experience. Divinity already exists within. You only remove the obstacles that stand in the way.
The body must be held upright, with head and neck straight, steady and motionless. Gaze at the tip of your nose, looking within. The intellect should be firmly in place, preventing the mind from wandering. The nature of the mind is to be restless and unsteady. The intellect holds it on one thought.