Arjuna is a kṣatriya. His duty is to fight, to give protection to the poor and to annihilate the disturbing element. That is kṣatriya's duty. So Arjuna was trained in that way—he was a soldier—but by his soldier's business, occupational duty, he satisfied Kṛṣṇa. He fought for Kṛṣṇa, not for his personal sense gratification. That is his test, saṁsiddhir hari-toṣaṇam (SB 1.2.13).
So here also Sūta Goswāmī says, dharmaḥ svanuṣṭhitasya, dharmaḥ svanuṣṭhitaḥ puṁsaṁ viṣvaksena-kathāsu-yaḥ (SB 1.2.8). You can discharge your duty very nicely, but you have to see whether you are developing attachment for Kṛṣṇa. Attachment means love, whether you are trying to satisfy Kṛṣṇa. That is the test. If that is not done, simply formulas, if you execute the formula, as I explained the other day, niyamāgraha, without any satisfaction of Kṛṣṇa, then Sūta Gosvāmī says it is simply laboring and waste of time, viṣvaksena-kathāsu-yaḥ notpādayed ratiṁ yadi, śrama eva hi kevalam.