'𝙒𝙝𝙖𝙩 𝙞𝙨 𝙆𝙖𝙧𝙢𝙖' is Arjun's next question which is in response to Krishna's assurance that one realises 𝙖𝙠𝙝𝙞𝙡𝙖𝙢-𝙠𝙖𝙧𝙢𝙖 (all aspects of 𝙠𝙖𝙧𝙢𝙖, 𝙖𝙠𝙖𝙧𝙢𝙖 and 𝙫𝙞𝙠𝙖𝙧𝙢𝙖) when one strives for liberation by taking refuge in HIM (7.29). To this Krishna replies, "Detachment or sacrifice of cosmic energy capable of creation (𝙗𝙝𝙪𝙩𝙖-𝙗𝙝𝙖𝙫𝙖-𝙪𝙙𝙗𝙝𝙖𝙫𝙖-𝙠𝙖𝙧𝙖𝙝 𝙫𝙞𝙨𝙖𝙧𝙜𝙖) is called 𝙠𝙖𝙧𝙢𝙖" (8.3). This is a difficult explanation to comprehend and the interpretations complicate the issue rather than giving clarity. Usual interpretations of 𝙠𝙖𝙧𝙢𝙖 suggest it to be noble deeds, creation or 𝙮𝙖𝙜𝙣𝙖, but all of them fail to satisfy what Krishna means.
While Krishna's reply regarding '𝙠𝙖𝙧𝙢𝙖' is at the level of 'being', we interpret it at 'doing' level. That's why our understanding that 'what we do' is '𝙠𝙖𝙧𝙢𝙖' falls short, as different people keep doing different things at different times, whereas any definition should be valid for every point in time -be it past when humans didn't exist, present or even future; and for every entity.
Krishna used the word '𝙫𝙞𝙨𝙖𝙧𝙜𝙖' which is detachment or sacrifice. 𝙆𝙖𝙧𝙢𝙖 is the detachment or diversion of the energy which is capable of creation. The closest example is the high voltage transmission line carrying large quantities of electricity (energy). When a part of it is diverted, that diversion is '𝙆𝙖𝙧𝙢𝙖' and 𝙠𝙖𝙧𝙢𝙖-𝙥𝙝𝙖𝙡 is energising the numerous electrical appliances.
If this analogy is applied to our existence, '𝙠𝙖𝙧𝙢𝙖' is drawing from infinite cosmic energy. Firstly, who draws the energy? Like the voltage difference, the difference in the three 𝙜𝙪𝙣𝙖𝙨 held by various entities leads to the drawing of the energy through the cable of 𝙨𝙝𝙧𝙖𝙙𝙙𝙝𝙖. While this happens automatically, out of delusion we attach ourselves to the process of '𝙫𝙞𝙨𝙖𝙧𝙜𝙖' and presume to be 𝙠𝙖𝙧𝙩𝙖 which we are not. Secondly, once energy is drawn, none have any control over its consequences or 𝙠𝙖𝙧𝙢𝙖-𝙥𝙝𝙖𝙡 (2.47).