Krishna has just told Arjuna that the great solar dynasties received this yoga of action as a living transmission. Now he grounds that claim by pointing to what those ancient actors actually did: they acted, and they acted without grasping at results.
evaṃ jñātvā kṛtaṃ karma pūrvair api mumukṣubhiḥ | kuru karmaiva tasmāt tvaṃ pūrvaiḥ pūrvataram kṛtam ||
Knowing this (that action does not bind the one who acts without clinging to results), the ancient seekers of liberation also performed their actions. Therefore you too should perform action, just as those ancients did before you.
Krishna is not saying 'do it because your ancestors did it.' He is saying: the ones who understood this fully still chose to act. The precedent is evidence that understanding does not lead to withdrawal. If those who were most free still engaged the field, inaction cannot be the mark of understanding.
The people cited are explicitly seekers of liberation, not people bound by obligation or social role. And yet they acted. This dismantles the assumption that the spiritually serious person retreats. The verse is a direct argument against using inner development as a reason to disengage.
The sequence matters: evaṃ jñātvā, 'having known this, act.' The understanding is not a byproduct of acting rightly. It comes first. Once you have seen how action without grasping actually works, the acting follows naturally. The confusion lifts, and what remains is the capacity to move.
Throughout the Gita, Krishna oscillates between the universal (the person who is wise, the one who acts rightly) and the direct address (you, Arjuna). The shift to tasmāt tvaṃ is not rhetorical flourish. It is the moment when the general teaching becomes an immediate invitation. General insight lives in the mind. Personal address asks for a response.
Person A hears about non-attachment and concludes that caring too much is the problem, so the solution is to care less, engage less, hold back. They mistake detachment for distance. They do less, risk less, and call it wisdom. The confusion and the paralysis look very similar from the outside. Person B has actually understood the same teaching. They act with full commitment because the outcome is no longer the thing they are protecting. They can throw themselves into the work precisely because their identity is not riding on how it turns out. They are, if anything, more engaged, more present, more willing to move into difficulty. The freedom shows up as greater capacity for action, not less.
Verse 4.16 opens one of the Gita's most precise inquiries: even the wise are confused about what action actually is, and what inaction is. Krishna is about to pull apart the ordinary categories. When ready, say: "4.16"