Chapter 2 · Verse 50
Krishna has been building toward a practical definition of yoga. Here he lands it: not as a spiritual exercise but as a specific relationship between action and the mind doing the acting.
buddhi-yukto jahātīha ubhe sukṛta-duṣkṛte | tasmād yogāya yujyasva yogaḥ karmasu kauśalam ||
1.Plain meaning
One who is joined to buddhi (discriminating intelligence) leaves behind both good deeds and bad deeds in this very life. Therefore, yoke yourself to yoga. Yoga is skill in action.
2.Line by line
jahātīha ubhe sukṛta-duṣkṛte
tasmād yogāya yujyasva
yogaḥ karmasu kauśalam
3.What is really happening
A.Karma is a stickiness problem, not a moral ledger
What makes an action bind you is not whether it is good or bad by some moral code. It is whether the doer is grabbed by the result. Actions done with that grabbing quality leave a residue. Actions done without it pass through cleanly. Both categories of residue (merit and demerit) keep the carousel spinning.
B.The definition of yoga lands here, not in the earlier chapters
This is the payoff line of the whole second chapter buildup. Everything before this was clearing ground. The actual definition of yoga, the practice Krishna is pointing at, is delivered in five words: yogaḥ karmasu kauśalam. Yoga is skill in action. Not renunciation of action. Not devotion to a deity. Skill.
C.Skill here is an interior quality, not technique
Kauśalam is not about being better at your job. It is about the absence of a particular kind of inner noise when you do your job: the noise of hoping the result will confirm you, or fearing it will expose you. Skill in this sense is what is left when that noise is gone. The action is the same; the person doing it is different.
D.Buddhi-yukta is the prerequisite, not the result
You do not leave behind good and bad karma and then get clear. You operate from buddhi first, and the non-sticking is a consequence. The interior steadiness comes first; the freedom from karmic residue follows. Arjuna is being told to reverse his usual causal story.
4.Modern parallel
Person A is a good professional and knows it. They work hard partly because they care about the work and partly because good results confirm they are good. When a project fails, it stings somewhere deep. When it succeeds, there is relief mixed with the satisfaction. They are collecting outcomes as evidence of their worth. Person B does the same work with the same care but without running that background calculation. They give the project their full attention without needing it to come back with a verdict. If it fails, they look at what failed and adjust. If it succeeds, they notice and move on. They are not less invested. They are just not harvesting the results for self-image. That second mode is what kauśalam is pointing at.
5.Name diagnostic
Kaunteya
From Kuntī (Arjuna's mother) + eya (son of). Literally 'son of Kunti.'At the moment Krishna is delivering the most important practical definition in the entire Gita, he addresses Arjuna through his lineage, as the son of Kunti. Kunti is known for her quality of equanimity in the face of extraordinary difficulty (she invoked divine powers without desire for personal gain). Calling Arjuna 'son of Kunti' at exactly this moment is a quiet reminder: this capacity is in your blood. The steadiness being described is not foreign to you. It was modeled by the person who raised you.
→What comes next
Verse 51 extends this further: the buddhi-yukta person also discards the results that are born of action and reaches a state beyond suffering. When ready, say: "2.51"