This is the last sloka of 15th chapter. Lord Krishna explains the significance of this chapter and benefits of the knowledge. We have seen till now seen how lord Krishna has started explaining the world as a tree and how it this tree of the world is sustained. He also explained the earth and sustenance of life on it. He further moves to the microcosm level and explains human life, birth and death cycle. At every stage he emphasizes that he alone is the cause of existence and that he is the substratum of all. Thus he makes us understand the ultimate reality of Brahman.
15.20 – ithi guhyatamam sastram iti uktam maya anagha
Etat bhuddva budhhimaanasya krta-krityah cha bharata
Meaning of words:
Guhyataam – most secretive/mystical
Sastram – scripture
Iti utkam maya – has thus been uttered by me
Anagha – ignorant person
Etat – this scripture
Buddhiman – wise
Krta-krtiyah – reaching target
Bharata – son of bharata dynasty
Meaning of sloka
Arjuna , the son of bharata dynasty, this most secretive/mystical scripture I mentioned , if understood will make a person wise and he would feel that he has achieved what needs to be achieved in this world.
This chapter contains all the essence of Vedas, the import of the gita is mentioned in brief here. Hence even though Gita is a smrithi, Lord Krishna calls this chapter itself as a shastra. It is a very secrective and mystical scripture because, knowing that brahman alone exists is easy, but putting it into practice is very difficult. One should get the knowledge of ultimate reality, practice to accept everything in the world as brahman itself and be ever established in brahman. As it’s a difficult path to tread, as its difficult to understand such an abstract subject and contemplate on it, the lord calls it as mystical. Out of crores of people , only thousands come to know about brahman by the grace of GOD, out of the thousands of people only few people can realize it. Hence its considered to be mystical, not easy to be understood by all.
Ones a person realizes the true nature of the world, he knows that nothing but brahman alone exists in the world. Thus when one understands this he becomes wise, he develops a strong conviction that there is no duality in the world and that everything is an illusion. Like the water in the desert seems to exist so also this world seems to exist. As desert only is real and water is just an illusion, so also the ultimate reality of brahman alone exists as the substratum. When a person knows and understands this, he will have nothing else to achieve in this world. He is ever blissful, he is unaffected by the worldly activities, he is ever immersed in the self , which alone is real, thus he becomes wise. He develops a krita-kritya bhavam, meaning attaining which there is nothing else to achieve.
Thus Krishna concludes the chapter saying that, knowing brahman , understanding brahman as all pervading and being ever established in brahman a person would get moksha.