Gita Chapter 18.16 to 18.20

Tatraivam sati kartaaram aatmaanam kevalam tu yah;
Pashyatyakritabuddhitwaan na sa pashyati durmatih.
16. Now, such being the case, he who, owing to untrained understanding, looks upon his Self, which is isolated, as the agent, he of perverted intelligence, sees not.

Yasya naahankrito bhaavo buddhiryasya na lipyate;
Hatwaapi sa imaam llokaan na hanti na nibadhyate.
17. He who is ever free from the egoistic notion, whose intelligence is not tainted by (good or evil), though he slays these people, he slayeth not, nor is he bound (by the action).

Jnaanam jneyam parijnaataa trividhaa karmachodanaa;
Karanam karma karteti trividhah karmasangrahah.
18. Knowledge, the knowable and the knower form the threefold impulse to action; the organ, the action and the agent form the threefold basis of action.

Jnaanam karma cha kartaa cha tridhaiva gunabhedatah;
Prochyate gunasankhyaane yathaavacchrinu taanyapi.
19. Knowledge, action and the actor are declared in the science of the Gunas (the Sankhya philosophy) to be of three kinds only, according to the distinction of the Gunas. Hear them also duly.

Sarvabhooteshu yenaikam bhaavamavyayameekshate;
Avibhaktam vibhakteshu tajjnaanam viddhi saattwikam.
20. That by which one sees the one indestructible Reality in all beings, not separate in all the separate beings—know thou that knowledge to be Sattwic (pure).

Gita Chapter 14.26 to 14.27

Maam cha yo’vyabhichaarena bhaktiyogena sevate;
Sa gunaan samateetyaitaan brahmabhooyaaya kalpate.
26. And he who serves Me with unswerving devotion, he, crossing beyond the qualities, is fit for becoming Brahman.

Brahmano hi pratishthaa’ham amritasyaavyayasya cha;
Shaashwatasya cha dharmasya sukhasyaikaantikasya cha.
27. For I am the abode of Brahman, the immortal and the immutable, of everlasting Dharma and of absolute bliss.

Hari Om Tat Sat

Iti Srimad Bhagavadgeetaasoopanishatsu Brahmavidyaayaam

Yogashaastre Sri Krishnaarjunasamvaade

Gunatrayavibhaagayogo Naama Chaturdasho’dhyaayah

Thus in the Upanishads of the glorious Bhagavad Gita, the science of the Eternal, the

scripture of Yoga, the dialogue between Sri Krishna and Arjuna, ends the fourteenth discourse

entitled:

“The Yoga of the Division Of the Three Gunas”

THE YOGA OF THE DIVISION OF THE THREE GUNAS

Summary of Fourteenth Discourse

Knowledge of the three cosmic qualities or Gunas, namely, Sattwa, Rajas and Tamas is now given through this discourse. The knowledge of these three Gunas, which hold the entire universe and all creatures under their sway, is of vital importance to each and everyone for their progress and happiness in life. Without this knowledge one will be forever bound by sorrow. In this knowledge we have the secret of success in worldly life as well as in spiritual life. Therefore, one should acquire this precious knowledge.
Lord Krishna reveals that these three qualities compose the Cosmic Nature. This Cosmic Nature is the primal source and origin of the entire creation and all things in it. Hence all things created are subject to their influence and irresistible power. The individual soul also is bound to the body by these three qualities present in Cosmic Nature. The Supreme Being brings about creation through the help of His Prakriti (Nature) endowed with these threefold qualities.
The highest of the three qualities is Sattwa. It is pure. It brings about happiness, wisdom and also illumination. The second quality of Rajas gives rise to passion manifested by intense attachment and greed. It causes sorrow and suffering. The third, termed Tamas, is the worst of all. It arises due to ignorance and results in darkness, lethargy and delusion.
Krishna asks us to diligently endeavour to cast out Tamas from our nature. We should control and master Rajas, and by holding it in check, wisely divert its power towards good kinds of activities. Sattwa should be carefully cultivated, developed and conserved in order to enable us to attain immortality. The realised sage, of course, goes beyond all these qualities, for, although it is Sattwa that enables him to reach God, even this quality will bind him if he is attached to it.
The aspirant should know the symptoms and signs of their presence in his personality and acquire a knowledge of their subtle workings. Then only can he maintain an unhampered and smooth progress in all activities of his life, both secular as well as spiritual. Lord Krishna teaches us this important subject in this discourse from the ninth to the eighteenth verse. He declares that one who rises beyond all the three Gunas through spiritual practices, becomes free from birth, death, old age and sorrow, and enjoys immortality.
In reply to a question from Arjuna, the blessed Lord describes the marks of one who has risen above the three Gunas. He states that if one constantly worships Him with exclusive devotion one will attain the highest divine experience and supreme peace and blessedness.