If you work as a Brahmin . . . if you are thinking yourself as a brāhmaṇa, then you act as brāhmaṇa. You cannot act as a śūdra. As a brāhmaṇa you cannot accept anyone's service; then you become śūdra. You deviate from your own position. Brāhmaṇa, kṣatriya, vaiśya, they'll never accept anyone's service, only the śūdra. Paricaryātmakaṁ karma śūdra-karma svabhāva-jam (BG 18.44). When you live at the mercy of others, this is called dog's business. Just like a dog lives at the mercy of the master. So it is strictly prohibited for the brāhmaṇas. Even in very difficult position, you can act as a kṣatriya, you can act as a vaiśya, but never accept the position of a dog, a śūdra. This is injunction. Sve sve karmaṇi, you stick to your own business. If you claim as a brāhmaṇa, you must act as a brāhmaṇa. Then you'll become successful. You cannot remain a brāhmaṇa and accept the business of a dog. That is not sve sve karmaṇi.
So everything, what is stated there in the Bhagavad-gītā, that is perfect. People at the present moment, they are living at the mercy of others. That is dog's business. Therefore in the śāstra it is said kalau śūdra-sambhavaḥ. In the Kali-yuga everyone is a śūdra. There is no Brahmin, no kṣatriya, no vaiśya. That is generally accepted. Because at the present moment education means to get some service. What is the value of that education? If you become dependent on others, then what is the value of this education? Therefore kalau śūdra-sambhavaḥ, everyone is a śūdra. But this Kṛṣṇa consciousness movement says, striyo vaiśyās tathā śūdrāḥ (BG 9.32): never mind, even if you are śūdra, take to Kṛṣṇa consciousness, you'll become perfect. Either you become woman or vaiśya or śūdra, it doesn't matter, or any other pāpa-yoni, māṁ hi pārtha vyapāśritya ye 'pi syuḥ pāpa-yonayaḥ, te 'pi yānti parām (BG 9.32). So this is the most liberal movement, that it doesn't matter what you are, if you take to Kṛṣṇa consciousness then you become perfect. Sa guṇān samatītyaitān brahma-bhūyāya kalpate (BG 14.26). He's on the Brahman platform, above all these different modes of material nature. These brāhmaṇa, kṣatriya, vaiśya, śūdra, these are differences on the material platform. But when you come to the spiritual platform, there is no such difference. Paṇḍitāḥ sama-darśinaḥ (BG 5.18).