This summary is about svadharma, one's own duty. The Gita says this in the middle, in verses 3.33 to 3.37, and says it again at the end, in verses 18.41 to 18.48. On the road of karma yoga, before it comes Can We Simply Stop Acting?.
The answer in one line
Svadharma is the duty that fits your own nature and qualities. One's own duty done with shortcomings is better than another's duty done well (Gita 3.35, Gita 18.47).
What problem this answers
Which road is my own? And if it is imperfect, is it right to stay on it?
The setting
Arjuna wishes to give up the work. The Lord first says that nobody remains even for a moment without action (Gita 3.5). So sitting back after leaving is no way.
Then the next question rises: if action must be done, which? One's own, or someone else's? The answer is in verses 3.33 to 3.35.
The svadharma of the second chapter was tied to Arjuna being a warrior (Gita 2.31–37). Here the subject is what applies to every human being.
The third chapter: three things
Verse 3.33 says that even the wise acts according to his own nature. All beings follow nature. What then will mere suppression do?
Verse 3.34 says that attraction and aversion sit with every object of the senses. Do not come under their power, for they are the enemies on the road to good.
Verse 3.35 says that one's own duty, even with a fault, is better than another's duty done well. Dying in one's own duty is good, and another's duty brings fear.
Verse 3.33: nature is a fact
Nature is a fact. It does not vanish by wishing. Trying to become someone else is also a kind of suppression, where the real leaning is covered and a borrowed face put on. It does not last long. Verses 18.59 and 18.60 say the same: what you do not wish to do out of delusion, you will do helplessly, bound by your own nature (Gita 18.59–60).
Verse 3.34: nature and liking are different
Nature is what you are: your understanding, your ability, your natural leaning. Liking is what pulls at this moment. Liking keeps changing. If you let it show the road, the road will change every day. Respect nature, but do not let it become another name for likes and dislikes.
Verse 3.35: why another's duty brings fear
A borrowed road measures every step against someone else. There is no footing of one's own, and with every slip there is fear of being found out. In one's own duty even the faults are one's own, and the strength to mend them is within.
"Dying in one's own duty is good" is not an invitation to risk. The feeling is that to lose something on one's own road is better than spending a whole life in imitation. The comparison is not about outer shine. It is about the place where the worker stands.
Why we go astray
In verse 3.36 Arjuna asks why a man commits wrong even when he does not wish to. The answer in verse 3.37 is desire, which turns into anger. It is born of passion, never filled, and greatly sinful. Know this as the enemy.
The root of going astray is not weakness. The root is desire and anger. In pull and irritation a person either grabs someone else's shining road, or drops his own work halfway. The remedy is not to scold oneself. It is to recognise the desire that is pulling one from one's place.
The eighteenth chapter: the same teaching, deeper
Verse 18.41 says that the division of actions rests on the qualities born of nature: goodness, passion and darkness.
Verses 18.42 to 18.44 name four kinds of work and their qualities. For those who hold knowledge, the qualities are peace, restraint, austerity, purity, forgiveness, straightness, knowledge and faith. For those who protect and lead, they are courage, brightness, steadiness, skill, giving and the power to rule. For those who produce and trade, the works are farming, tending cattle and commerce. And the fourth is work of service.
The base is quality and action, not birth. Verse 4.13 says the same. Nobody is high or low. The same self is in all (Gita 5.18), and the door to the supreme goal is open to all (Gita 9.32). These lists are a way of recognising qualities and works. They do not weigh anyone's worth.
One's own work as worship
Verses 18.45 and 18.46 say that a person devoted to his own natural work reaches perfection, and that the One from whom all has come can be worshipped through one's natural work (Gita 18.45–46). There is nowhere to go for worship. The work in hand is itself the offering plate. By this work becomes an offering, and the divide between big and small work loosens.
Verse 18.47
Verse 3.35 returns here in almost the same words, with a new reason: one who does the work set by nature incurs no sin (Gita 18.47). At the end the Gita brings Arjuna to the same place: his own work, by his own nature, in the spirit of offering.
Verse 18.48
Natural work should not be left even if it has a fault, for all actions are covered by fault, as fire is by smoke (Gita 18.48). We do not put out the hearth for fear of smoke. We light the fire well. Waiting for faultless work is also a way of leaving work. Mend it, polish it, but do not leave it.
The two chapters side by side
Nature as the base is in both. In the third chapter it is said that all follow nature (Gita 3.33), and in the eighteenth that actions are divided by qualities born of nature (Gita 18.41).
On the spirit of doing, the third chapter says not to come under attraction and aversion (Gita 3.34), and the eighteenth says to worship the Lord through work (Gita 18.45–46).
That one's own duty is better even when imperfect is put, in the third, as another's duty bringing fear (Gita 3.35), and in the eighteenth as no sin coming to one who does natural work (Gita 18.47).
And not leaving work because of a shortfall is only in the eighteenth, with the image of fire and smoke (Gita 18.48).
The third chapter gives the reason and warns of the danger. The eighteenth carries it to worship and perfection. First one's own duty saves from fear, and then the same becomes the road to perfection.
Why one's own duty is better: other supports in the Gita
Verse 2.40 says that even a little of this dharma saves from great fear. Even a small step on one's own road is not wasted (Gita 2.40).
Verses 3.19 and 3.20 say that one who does duty without attachment reaches the Supreme, and that Janaka became perfect through daily duty (Gita 3.19–20).
Verses 6.5 and 6.6 say that one's own duty is no cage. Lift yourself by the mind, for the mind is a friend and also an enemy (Gita 6.5–6). Nature is a beginning, not an end.
Verse 12.13 says that one who walks his own road does not think another's road small. He is without hatred, a friend and compassionate (Gita 12.13).
And verse 3.9 says that action done in the spirit of sacrifice does not bind (Gita 3.9). That is the way to make one's own duty worship.
The order is this. Start from your own nature. Do not let liking and disliking show the way. Give up the grip on the fruit and offer the work. Then the fear of another's road goes, and a calm trust comes.
Your own or borrowed: five signs
The first sign is fear at every step of slipping or being found out (Gita 3.35). The second is having to suppress yourself every day, even months later (Gita 3.33). The third is repeated comparison and jealousy toward those who do the same work. Verse 4.22 says that one who stays in his place is free of jealousy (Gita 4.22). The fourth is whether the work was chosen by liking or by fit with nature (Gita 3.34). And the fifth is whether you can hand this work over to the Lord (Gita 18.46).
These signs are for testing yourself, not for passing judgment on others. Hard work is not borrowed work. Difficulty comes with every duty (Gita 18.48).
The mind to carry it in: giving up the claim on the fruit
Finding one's own duty is half the matter. The other half is the mind in which to carry it. The right is to action, not to fruit, and staying even in success and failure is equanimity (Gita 2.47–48).
A borrowed road is really a chase after someone else's fruit, such as praise, position and recognition. The moment the grip on the fruit loosens, its shine fades. Even in one's own duty, the grip on the fruit brings fear, and then every shortfall stings.
One's own duty is not selfishness. The wise should act for the good of the world, without attachment (Gita 3.25). The farmer, the teacher and the caregiver are all of use to others.
Five misunderstandings
The first misunderstanding is that svadharma means the family trade or caste. That is not so. The base is qualities born of nature (Gita 18.41, Gita 4.13), and the same self is in all (Gita 5.18).
The second is that one must stay in the role one got, always. That is not so. Nature is a beginning, not a prison (Gita 6.5). Duty can ripen and change with understanding.
The third is that one's own duty is whatever feels good. That is not so. Likes and dislikes are enemies (Gita 3.34).
The fourth is that if it is my own duty, it needs no mending. That is not so. There are faults (Gita 18.48). The lesson is not to leave the work because of faults, not to let faults stay.
The fifth is that it is fine to hurt someone in the name of one's own duty. That is not so. One's own duty is free of hatred and tied to friendliness and compassion (Gita 12.13).
Questions people ask
If everyone follows nature, can anyone change? Yes. By the mind we can raise or lower ourselves (Gita 6.5–6), and not coming under attraction and aversion is the way of change (Gita 3.34).
Why is "dying in one's own duty good"? Loyalty to one's own place is better than safe imitation. The reason is in the next part: another's duty brings fear (Gita 3.35).
Does the Gita forbid changing one's work? No. What it forbids is a road that is another's and against one's nature. A change that takes one closer to one's nature is also one's own duty.
How is this different from "do whatever you like"? Liking changes and is called an enemy (Gita 3.34). Svadharma is settled by nature and duty, and carried in the spirit of offering (Gita 18.46).
What if my work looks small? Everyone reaches perfection through his natural work (Gita 18.45), and worship can be done through any work (Gita 18.46). What matters is the spirit in which the work is done.
If you have to explain it in thirty seconds
The work that fits your own nature is your own duty. Even to do it imperfectly is better than doing another's shining road well, because another's road brings fear. But nature does not mean liking. Likes, dislikes and desire are what lead us astray. Offer your work as worship, give up the claim on the fruit, and when faults show, mend them but do not leave the work. Where there is fire there is always smoke.
Related hubs: Can We Simply Stop Acting? (before) · Equanimity · The Enemy Called Desire · Offering All Actions