Verse
यतेन्द्रियमनोबुद्धिर् मुनिर्मोक्षपरायणः ।विगतेच्छाभयक्रोधो यः सदा मुक्त एव सः ॥
Having put outside of himself all outward touches and concentrated the vision between the eyebrows and made equal the prāṇa and the apānau moving within the nostrils, having controlled the senses, the mind and the understanding, the sage devoted to liberation, from whom desire and wrath and fear have passed away, is ever free.
Gītā 5·28