Attaining pure knowledge from (restraining) the mind, the ascetic should sit self-controlled. One necessarily becomes that on which one's mind is set. This is an eternal mystery.
चित्तं चित्तादुपागम्य मुनिरासीत संयतः। याच्चित्तं तन्मयो वश्यं गुह्यमेतत् सनातनम्॥