He should make stable his sight on the airs and earth by investigating the aim equal to the length of a Urad seed. (The successive hymns i.e., 20, 21, 22 explains the manner of penance in which all Tanmåträs are restricted, the sound generated as a result of the exercise made in the heart and adding by this procedure the self-sensitivity to the sensitivity of Brahma. The sage has given the hints for the process of self-perceiving by establishing control on all Tanmatray existing process in the body in the hymn 18 and 19. A combination of the formidable and micro processes is existed in it. The inner perceiving can be obtained only with the five Tanmåtrås i.e. the word, the touch complexion, essence and smell. That iota may be at the somewhere place in the mind and at the adjunction of the nose root and the ear root. Where the sensing cells for the smell are existed, concentration through inner eyes cannot get any place due to presence of smell into nostrils and words in the air. Thus, a strong perceiving of the sensitivity of Brahma viz. the inner most position can only be possible when all Tanmäträs of exterior world are set aside.)