एतद्बुध्वा बुद्धिमान् स्यात्कृतकृत्यश्च भारत ॥ २० ॥
iti guhyatamaṃ śāstramidamuktaṃ mayā’nagha .
etadbudhvā buddhimān syātkṛtakṛtyaśca bhārata .. 20 ..
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Though the whole of the Gītā is called Science (Śāstra) yet from the context it appears that the fifteenth discourse alone is here spoken of as the Science, for the purpose of extolling it. In fact the whole teaching of the Gītā-Śāstra has been summed up in this discourse. Not the teaching of the Gītā-Śāstra only, but the whole teaching of the Veda is here embodied: and it has been said that ‘he who knows it
(the Aśvattha) knows the Veda ‘(xii. 1). and that’It is who am to be known by all the Vedas ‘(xv. 15). On knowing this science as taught above—but not otherwise—a man becomes wise. He has accomplished all duties. Whatever duty a brahmana of superior birth has to do, all that duty has been done when the real truth about the Lord is known; that is to say, by no other means can a man’s duty have been accomplished. And it has been said “All actions, without exception, O son of Pṛthā, are comprehended in wisdom” (iv. 33). And here is the saying of Manu :
“This is the fulfilment of the birth, especially for a brahmana; for, by attaining to this does the twice-born become the accomplisher of all duties, and not otherwise” (xii. 93).
Since you have heard from Me this truth about the Supreme Being, you are a happy man, O Bharata.
श्रीकृष्णार्जुनसंवादे पुरुषोत्तमप्राप्तियोगो नाम
। पञ्चदशोऽध्यायः ।