51st Sutra Chapter 2: b The second fundamental quality of the fourth Pranayama is that it ends Dualities. Non Duality is being undisturbed by Dualistic thinking. Being untouched by the crests and troughs of the thought waves disturbing the mind. Non Duality is becoming one with our inner self, the witness consciousness, the soul, the Purush within. Becoming one with our Atma. Leading to becoming one with Paramatma. One with God, One with the Universe. ——————————————-   बाह्याभ्यन्तरविषयाक्षेपी चतुर्थः ॥२.५१॥ bāhya-ābhyantara viṣaya-akṣepī caturthaḥ ॥2.51॥   ·       bahya - external ·       abhyantara - internal ·       vishaya - objective ·       akshepi - transcending ·       chaturthah - the fourth.     ·       बाह्य - श्वास को बाहर निकाल कर बाहर ही रोकना ·       आभ्यन्तर- श्वास को भीतर लेकर भीतर ही रोकना ·       विषय - कार्य या कर्म का ·       आक्षेपी - रुओत्याग या विरोध करने वाला ·       चतुर्थ: - यह चौथा प्राणायाम है । श्वास को बाहर रोकने व अन्दर रोकने के विषय अर्थात कार्य का त्याग या विरोध करने वाला यह चौथा प्राणायाम है ———————————————