यज्ञशिष्टामृतभुजो यान्ति ब्रह्म सनातनम्।
नायं लोकोऽस्त्ययज्ञस्य कुतो़ऽन्यः कुरुसत्तम।।4.31।।
।।4.31।। हे कुरुश्रेष्ठ यज्ञ के अवशिष्ट अमृत को भोगने वाले पुरुष सनातन ब्रह्म को प्राप्त होते हैं। यज्ञ रहित पुरुष को यह लोक भी नहीं मिलता फिर परलोक कैसे मिलेगा
That person who does not perform yagna or offerings of worship to propitiate the Supreme Lord and who does not perform the regular and occasional duties as prescribed in the Vedic scriptures according to varnasrama or their rank and station in life. Such a person derives absolutely no benefit for receiving a human existence in this world. They have wasted a very precious opportunity as a human birth is very difficult to receive and humans are the only species on the Earth with freewill and the power to reflect on the Supreme. All the goals which humanity aspires for will also allude them for without following the ordinances of the Vedic scriptures which bequeath promotion in the material worlds how can one who never performs yagna even on the level of the food they eat ever expect to be promoted to the heavenly spheres or ever become qualified for the ultimate achievement of moksa or liberation from the cycle of birth and death in the material existence. Moksa is the true goal of all human endeavour and real purpose of human existence. The divine discourse of the Bhagavad-Gita is all about moksa which is the eternal summum bonum or greatest good eternally for all humanity.