A man's relationship with his sister's husband is based on his relationship with his sister. The brother-in-law, prior to his marriage with the sister, was a complete stranger to the man. And when their children become the man's nieces and nephews, his relationship with them is also based on his sister. Similar relationships grow up among races and nationalities, centering on the country of birth. Thus we have Indians, Bengalis, Punjabis, Germans, and so on. We also find relationships centering on religious beliefs. Thus there are Hindus, Muslims, Christians, and so on. But however much we might endeavor to adapt to such partial personalities of the self, and however we try to increase the number of these fractional identities, we will remain infinitesimal and partial. Being part and parcel of the Supreme Lord, if we do not aspire to serve Him, then we forgo our actual identity and fall down into nescience. An appropriate parallel is the functioning of the body: If a limb refuses to execute its usual duty, it becomes useless to the body. Similarly, if our activities are not focused on Lord Kṛṣṇa, they are rendered impotent and valueless. The eternal constitutional position of the self is to serve the Supreme Lord, Kṛṣṇa. In fact, all our sufferings start from our refusal to act in our original capacity as Lord Kṛṣṇa's eternal servants. Therefore, the prime duty of all living entities is to become re-instated in their original, consitutional position. The first step toward that goal is to perform karma-yoga. In the Caitanya-caritāmṛta it is stated, "The living entity is bound around the neck by the chain of māyā because he has forgotten that he is eternally a servant of Kṛṣṇa."
People in general are ignorant and addicted to fruitive activities. Without disturbing their minds, the karma-yogī can benefit them by explaining the truth about man's eternal position as Lord Kṛṣṇa's servant. Thus in the Bhagavad-gītā (3.26) Lord Kṛṣṇa instructs,
So as not to disrupt the minds of ignorant men attached to the fruitive results of prescribed duties, a learned person should not induce them to stop work. Rather, by working in the spirit of devotion, he should engage them in all sorts of activities [for the gradual development of Kṛṣṇa consciousness].
It is very difficult to convince those who adhere to fruitive activities that they should render devotional service to Lord Kṛṣṇa. The reason is that most fruitive workers are foolish, fallen and impious. Therefore all their activities are whimsical and motivated by evil. Their intelligence and expertise are thus utilized in defiance of the Supreme Lord. They are totally in the grip of the illusory potency, māyā, and so they imagine themselves to be the Supreme Lord Himself, or at least His biggest competitor, like the demon Śiṣupāla. They simply try to enjoy this material world in various ways. In fact, their hopes for enjoying this world are just make—believe, or māyā, and this make-believe yearning leaves them hopelessly cheated. Yet they cannot give up the hope to enjoy. And when they realize that fruitive activities are futile and are more or less forced to renounce them, then such renunciation becomes merely another illusory scheme for a greater enjoyment.
Those who hanker after the fruits of their actions undertake many hardships in executing their work, their imagination wanders like an untethered bull, and all the while their mind dictates to them that they are the actual enjoyers. Therefore, without disrupting the minds of these foolish, perverted karmīs, the intelligent person should engage them in doing what they are expert in and using the fruits in Lord Kṛṣṇa's service. Such a course of action will automatically uncover the fruitive workers' eternal relationship with Lord Kṛṣṇa. So, to instruct the people for their benefit, the servant of Kṛṣṇa, who is free from the reactions of fruitive activities, will lead a life seemingly like that of the fruitive workers, but actually he is all along performing karma-yoga.