Chapter 4 opens with Krishna revealing the sacred lineage of this spiritual knowledge. He taught this imperishable yoga to Vivasvan (the sun-god), who taught it to Manu (the father of mankind), who taught it to Ikshvaku (the forefather of kings). This parampara or disciplic succession preserved the knowledge through the ages, but it became lost over time due to the corrupting influence of time.
Krishna is now re-establishing this ancient knowledge through Arjuna, His friend and devotee. This is a crucial teaching about how spiritual knowledge should be received - not through speculation or mental gymnastics, but through a bona fide succession of realized teachers.
Arjuna asks a logical question: Vivasvan was born long before Krishna, so how could Krishna have taught him? This leads to one of the most important revelations in the Gita - Krishna’s transcendental nature.
Krishna explains that both He and Arjuna have passed through many births, but while Arjuna has forgotten them, Krishna remembers all. Although unborn and possessing an imperishable nature, Krishna appears in this world through His internal energy. He descends whenever there is a decline of righteousness and a rise of irreligion.
The purpose of Krishna’s appearance (avatara) is twofold: to deliver the pious, to annihilate the miscreants, and to reestablish the principles of dharma. This happens age after age.
Krishna reveals that He reciprocates with all according to their surrender unto Him. Everyone follows His path in all respects. People worship Him in various ways - some as the impersonal Absolute, some as the Supreme Person, some indirectly through karma or jnana. But in all cases, He is the ultimate goal.
Those who desire success in their worldly activities worship the demigods, and they quickly achieve results in the material world. However, Krishna clarifies that He is the original creator of the social orders based on qualities and work (the four varnas). Though He is the creator, He is also the non-doer, being unchangeable.
Krishna addresses a profound philosophical question: What is action, and what is inaction? Even the intelligent are bewildered about this. One must understand action, wrong action, and inaction to be liberated from material bondage.
The key insight is this: One who sees inaction in action, and action in inaction, is intelligent among men. This means understanding that even while working, one who works without attachment and false ego is actually in a state of inaction (not creating karma). Conversely, one who refrains from action but mentally dwells on sense objects is still acting (creating karmic reactions through consciousness).
A person is considered learned whose every endeavor is devoid of desire for material enjoyment. Such a person’s works are burned up in the fire of perfect knowledge. Having abandoned attachment to results, always satisfied and independent, they perform no fruitive action although engaged in all kinds of activities.
Krishna describes various types of sacrifice performed by those seeking liberation: some offer material possessions, some practice austerities, some study the Vedas, some practice breath control (pranayama), some restrict eating, some offer their senses and sense objects in the fire of the controlled mind.
However, Krishna emphasizes that sacrifice in knowledge is superior to sacrifice with material possessions. All actions in their entirety culminate in knowledge. The purpose of all sacrifice is to achieve transcendental knowledge, which alone can liberate the soul.
Krishna provides clear instruction on how to acquire transcendental knowledge: approach a self-realized spiritual master, inquire from him submissively, and render service to him. Such a master can impart knowledge because he has seen the truth. Once you learn this knowledge, you will never again fall into illusion, and you will see all living beings in the Supreme and the Supreme in all beings.
This knowledge is so powerful that even if you are the most sinful of all sinners, you can cross the ocean of miseries by the boat of transcendental knowledge. Just as blazing fire reduces wood to ashes, the fire of knowledge burns all karmic reactions to ashes.
Krishna concludes this chapter by emphasizing the importance of faith (shraddha). One who is faithful and devoted, who controls the senses, attains transcendental knowledge. Upon attaining such knowledge, one quickly achieves supreme peace.
Conversely, the ignorant and faithless person who doubts the revealed scriptures does not achieve happiness in this world or the next. For one who has conquered doubt through transcendental knowledge and who is situated in the self through yoga, action does not bind.
Chapter 4 establishes the transcendental nature of Krishna and the supreme position of spiritual knowledge. It teaches us that true knowledge is not a product of intellectual speculation but a living tradition passed down through self-realized souls. This knowledge transforms our understanding of action itself - showing that work performed in consciousness of the Supreme creates no bondage. The chapter bridges karma yoga (action) and jnana yoga (knowledge), showing how proper action leads to perfect knowledge, which in turn perfects all action.