(Click to enlarge vintage painting of Krishna and Arjuna on the Battlefield of Kurukshetra)
"There are many yogis, they perform yoga system or teach yoga system for some profit, but that is not the idea of yoga system. Everything should be engaged in the service of the Lord. Everything. Whatever we do, either as ordinary worker or as sannyāsī or as yogi, or as jñānī, all our energies should be dovetailed with Kṛṣṇa consciousness. That is real sannyāsa, that is real yoga. Ārurukṣor muner yogaṁ karma kāraṇam ucyate. Those who are just stepping on the staircase of the yoga system, for them, karma kāraṇam ucyate, they must work. In the beginning, nobody should stop working. Nobody should stop working.
Just like you'll find in the Bhagavad-gītā that Kṛṣṇa requesting Arjuna to become a yogi, but He never asked him to cease from the fight. How one can become a yogi, at the same time remain a fighter? That, a practical example you see. Kṛṣṇa is asking Arjuna, tasmād yogī bhavārjuna. 'My dear Arjuna, therefore you become a yogi.' But at the same time, He's asking to fight. Now, we know the yogi sits down at a place and meditates and concentrates his mind and controls his senses. How is that he is fighting, at the same time yogi? Huh? This is the mystery of Bhagavad-gītā. You can remain a fighting man, at the same time the highest yogi, highest sannyāsī. How? In Kṛṣṇa consciousness. You have to fight for Kṛṣṇa. That's all. That is the secret. That is the secret. If you fight for Kṛṣṇa, work for Kṛṣṇa, if you eat for Kṛṣṇa, if you sleep for Kṛṣṇa, if you do everything for Kṛṣṇa, then you are the yogi, you are the sannyāsī, and you are everything. That is the secret of Bhagavad-gītā. It is practical example. We see that Arjuna is asked, tasmād yogī bhavārjuna. 'My dear...' Now you'll find in this chapter, Kṛṣṇa will instruct Arjuna how to become a dhyāna-yogī. That is meditation, yogi in meditation. He will ask Arjuna in this chapter, and you'll find, Arjuna will say, 'My dear Kṛṣṇa, it is impossible for me. It is impossible for me. This system which You recommend for meditation is not possible for me.' And actually also, although the instruction of yoga system is offered to Kṛṣṇa in very full details, you'll never find in the history of Arjuna's life that ever he became a meditator. Ever. Then how he became the most perfect yogi? Oh, that is, that we'll find at the end of this chapter, that 'One who is always thinking of Kṛṣṇa...'
yoginām api sarveṣāṁ
śraddhāvān bhajate yo māṁ
sa me yuktatamo mataḥ
Kṛṣṇa, when He saw that Arjuna, he is declining, then He said, 'My dear Arjuna, you are the highest yogi. You are the topmost yogi.' Why? 'Because you are always thinking of Me.' That's all. 'You have no other business than to think of Me.' So this is the yoga system, this is the sannyāsa system, this is the jñāna system. All perfections of jñāna, yoga, dhyāna, and whatever, sacrifice, charity, and penance, all the recommended activities for spiritual realization ends in Kṛṣṇa consciousness. So if you directly become Kṛṣṇa conscious, then you are yogi, sannyāsī, and everything. As it is stated here, sa sannyāsī ca yogī ca. 'He is sannyāsī, he is yogi, and he is everything.' He's everything. So this simple method, to become Kṛṣṇa conscious, is the highest perfection of life. Therefore this society is established for Kṛṣṇa consciousness. The techniques are there in the Bhagavad-gītā and there are Śrīmad-Bhāgavatam. Just try to accept this principle of life and your, this human form of life will be successful and perfect by Kṛṣṇa consciousness."
(Srila Prabhupada Lecture, New York, September 2, 1966)