Speech and mind are to be controlled by the Understanding, and the Understanding, in its turn, by the eye of knowledge. Knowledge, again, is to be controlled by the knowledge of the Soul, and finally the Soul it to be controlled by the Soul.
यच्छेद् वाङ्मनसी बुद्ध्या तां यच्छेज्ज्ञानचक्षुषा। ज्ञानमात्मावबोधेन यच्छेदात्मानमात्मना॥