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यज्ञे तपसि दाने च स्थितिः सदिति चोच्यते।कर्म चैव तदर्थीयं सदित्येवाभिधीयते।।17.27।।
17.27 Steadfastness in sacrifice, austerity and gift, is also called 'Sat' and also action in connection with these (or for the sake of the Supreme) is called 'Sat'.