"Everyone will experience that. So long he will be materially attached, he will find viparītāni. 'I wanted to be...' Sukhera lāgiyā, e ghara bandhinu, aguṇe puriyā gelā: 'I constructed this nice house for living happily, but there was fire, and everything finished.' This is the way. You construct everything for happiness, but there will be something which will put you into the most miserable condition. This is called material world. They do not know.
Therefore one who is intelligent, he thinks that 'If I have to work so hard for so-called happiness, and here is Kṛṣṇa is canvassing, asking me that "You work for Me," so why not work for Kṛṣṇa? Here I see viparītāni, everything is opposite. There is no happiness.' So that is intelligence. 'I have to work hard. Kṛṣṇa says, "Just surrender unto Me." ' Sarva-dharmān parityajya mām ekaṁ śaraṇaṁ vraja (BG 18.66). So Kṛṣṇa is asking to work for Him, giving up everything. That is clear, everyone knows. 'Here also I am working very hard, but here I am working hard to be happy, but the viparītāni, I am becoming unhappy. So why not work for Kṛṣṇa?' This is intelligence.
I have to work, after all. Jīvera svarūpa haya nitya-kṛṣṇera dāsa (CC Madhya 20.108-109). Constitutionally, every living entity is a servant. He's serving, eternal servant of Kṛṣṇa. If he does not serve Kṛṣṇa, then he will have to become servant of māyā. That's all. His servitude, servantship, will not go. Ḍheṅki svarga gele sva-dharmān. Ḍheṅki... Just like a ḍheṅki, you do not understand, the husking machine. Say a typewriter. So if you send the typewriter to the heaven, what does it mean? It is to be worked as typewriter. Does it mean because it has gone to heaven, the work has changed? No. The work will continue. Either in this hell or heaven, typewriter will kat-kat-kat-kat-kat. That's all.
Similarly, our position is servant. If you don't become servant of Kṛṣṇa, then you serve..., you become servant of your wife, your children, your relative, your country, your nation, your dog. At last, if you have no family, then you become servant of your dog. You know in your country it is very usual. If he has nobody, then he keeps a dog and takes it on the street. His dog passes stool, and he is standing, waiting: 'Yes, sir. You pass your stool, I am waiting.' Just see. It is practical. If you don't become servant of Kṛṣṇa, then you have to become servant of the dog. This is nature's way. Therefore intelligent person will take lesson from it, that 'I have to become servant. Why not become Kṛṣṇa's servant? Then I will be happy. There are so many Kṛṣṇa's servant; they are so happy. Why shall I remain the servant of the māyā?' "
(Srila Prabhupada Lecture, London, July 23, 1973)