Bhagavad Gita, Chapter 15, Verse 20

इति गुह्यतमं शास्त्रमिदमुक्तं मयानघ । एतद्बुद्ध्वा बुद्धिमान्स्यात्कृतकृत्यश्च भारत

iti guhyatamaṃ śāstramidamuktaṃ mayānagha | etadbuddhvā buddhimānsyātkṛtakṛtyaśca bhārata

Translation

Thus, this most Secret Science has been taught by Me, O sinless one; on knowing this, (a man) becomes wise, O Bhārata and all his duties are accomplished.

— Alladi Mahadeva Sastri

Word meanings

iti

thus

guhyatamam

most secret

śāstram

teaching

idam

this

uktam

spoken

mayā

by me

anagha

O sinless one

etat

this

buddhvā

having known

buddhimān

wise

syāt

may become

kṛtakṛtyaḥ

work, done, by whom, he

ca

and

bhārata

O Bhārata

Śaṅkarācārya's commentary

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' (xv.1), and that 'It is I 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 brāhmaṇa of superior birth has to do, all that duty has been done when the real truth about the Lord is known. As Manu says: "This is the fulfilment of the birth, especially for a brāhmaṇa; for, by attaining to this does the twice-born become the accomplisher of all duties, and not otherwise" (Manu xii.93). Since you have heard from Me this truth about the Supreme Being, you are a happy man, O Bhārata.