Devotee (3): "The Lord has given Arjuna confidential knowledge of the Supersoul within everyone's heart, and now He is giving the most confidential part of this knowledge: just surrender unto the Supreme Personality of Godhead. At the end of the Ninth Chapter He has said, 'Just always think of Me.' The same instruction is repeated here to stress the essence of the teachings of Bhagavad-gītā. This essence is not understood by a common man, but by one who is actually very dear to Kṛṣṇa, a pure devotee of Kṛṣṇa. This is the most important instruction in all Vedic literature. What Kṛṣṇa is saying in this connection is the most essential part of knowledge, and it should be carried out not only by Arjuna but by all living entities."
Prabhupāda: Guhyatamam, most confidential. This is not for all, but for the advanced person and who is in confidence of Kṛṣṇa, He says, iṣṭo 'si me . . .? What is that next? Iṣṭo 'si?
Devotee (3): Iṣṭo 'si me dṛḍham iti.
Prabhupāda: Eh?
Devotee (3): Iṣṭo 'si me dṛḍham iti tato vakṣyāmi.
Prabhupāda: Dṛḍham?
Devotee (3): Dṛḍham.
Prabhupāda: No. What is the spelling?
Devotee (3): Dṛḍham.
Prabhupāda: No, no, the word, separate word? Iṣṭo 'si?
Devotee (3): D-r-d-h-a-m.
Prabhupāda: Hitam.
Devotee (3): Dṛḍham iti tato vakṣyāmi te hitam.
Prabhupāda: Te hitam. So it is not for all. One who is in confidence of Kṛṣṇa, a pure devotee, for him, not for the ordinary man. Ordinary man—"You do your prescribed duty." But they have no prescribed duty even. The people of this age, they are so fallen, they have no prescribed duty. They are simply engaged like animals—eating, sleeping, sex and defense. That's all. Animal is engaged like that, eating, sleeping, sex, and defense. So we are being educated only like animals. We do not know the value of life, how nature is working, how we are changing our body. No education all over the world. Simply making plans how to eat, how to sleep, how to enjoy senses, how to defend, that's all. This is animal life. This is not prescribed duty. Prescribed duty is above this. From animal, one has to become brāhmaṇa, kṣatriya, vaiśya, utmost śūdra, like that. That is prescribed duty. And simply whole day working for eating, sleeping, mating, that is the business of the hog. Hog is also whole day working for eating, sleeping and sex and defense. Therefore śāstra says, nāyaṁ deho deha-bhājāṁ nṛloke kaṣṭān kāmān arhate viḍ-bhujāṁ ye (SB 5.5.1). You should not live the life of a hog, viḍ-bhujām. Viḍ-bhujām means the stool-eater. He is also working day and night. What is the business? "Where is stool?" That's all. And as soon as he's strong, then "Where is sex," without any discrimination. That is hog's life.
So human life is not meant for spoiling like hog's life. Therefore niyataṁ kuru karma tvam. You should classify yourself amongst the four divisions, cātur-varṇyaṁ mayā sṛṣṭaṁ guṇa-karma-vibhāgaśaḥ (BG 4.13), and then your prescribed duties are there. If you want to become a brāhmaṇa, then śamo damas titikṣā ārjavam, jñānaṁ vijñānam āstikyaṁ brahma-karma svabhāva-jam (BG 18.42). If you want to be kṣatriya, tejaḥ . . . What is that? Tejaḥ śauryaṁ yujyaṁ yuddhe cāpy apalāyanam īśvara-bhāvaś ca kṣātraṁ karma svabhāva-jam. If you want to be a vaiśya, kṛṣi-go-rakṣya-vāṇijyaṁ vaiśya-karma svabhāva-jam (BG 18.44). And if you want to remain a śūdra, paricaryātmakaṁ karma śūdra-karma svabhāva-jam. And that is prescribed duty. You classify yourself—either as a brāhmaṇa or as a kṣatriya or a vaiśya—by quality, not by caste or by whims, no. Actually by qualification. Then you engage yourself in that duty. That is niyataṁ karma tvam. Otherwise, jumping like monkeys, that is not karma. That is monkey's dance. It has no value. Wasting time. You should not waste time a single moment. Therefore Kṛṣṇa says, niyataṁ kuru karma tvam. So make that. Don't waste your time.