Our philosophy is,
- ataḥ pumbhir dvija-śreṣṭhā
- varṇāśrama-vibhāgaśaḥ
- varṇāśrama-vibhāgaśaḥ
- svanuṣṭhitasya dharmasya
- saṁsiddhir hari-toṣaṇam
- (SB 1.2.13)
You may be industrial administrator, you may be engineer, you may be something else, but you make your profession perfect. And that perfection is achieved by satisfying the Supreme Personality of Godhead by your profession. Just like Arjuna: He was a soldier. He knew how to fight. So by his profession he satisfied Kṛṣṇa. Kṛṣṇa wanted that there should be fight between the Kurus and the Pāṇḍavas for right cause. And Kṛṣṇa came—paritrāṇāya sādhunaṁ vināśāya ca duṣkṛtam (BG 4.8). He had two business: to give protection to the devotees and to kill the demons. So by Kṛṣṇa's will sometimes all the demons, they come together and fight with one another and they are killed.
So Battle of Kurukṣetra was such a plan to bring all the demons together and engage them in fighting and kill one another. Just like in our schooldays, unruly boys, one boy will be asked to catch the other boy by the ear and the same boy will be asked to catch this boy by the ear, and they are pulling each other—competition of pulling the ears. So Arjuna was fighter, and he helped Kṛṣṇa in this fighting activities, and thus he became a great devotee. Kṛṣṇa certified, bhakto 'si priyo 'si (BG 4.3): "You are My dear, very dear friend and devotee."
So it is not that one becomes a devotee simply by renouncing the world and coloring the dress. But in any dress, in any capacity, one can satisfy Kṛṣṇa if His cause is served. If you apply your engineering talent in Kṛṣṇa's service . . . suppose we have to construct a nice temple of Kṛṣṇa. So if you apply your talent to engineering—just like in India we have got very wonderful temples—so then your engineering becomes perfect. Similarly, if some business is done, if you apply your business administrative talent . . . just like we are doing some business, Spiritual Sky. That is small business, but they are managing very nicely. This boy, Svarūpa Dāmodara, he is a great scientist, doctor in chemistry. He is trying to explain Kṛṣṇa through chemistry. Similarly, you can try to serve Kṛṣṇa through engineering. You can serve Kṛṣṇa by business administration.