Caitanya Mahāprabhu's philosophy is that. Jīvera svarūpa haya nitya-kṛṣṇa-dāsa (CC Madhya 20.108). That is our permanent situation—we are servant of God. I have explained yesterday that we are part and parcel of God. Now, as part and parcel of God, what is our duty? The example I have given. Just like the finger is the part and parcel of my body. So what is the duty? As soon as I say, "Finger, please come here," it comes. "Finger, come here. Do this, do that, pick up." This is finger's business. A finger cannot remain independent. Or if the finger cannot give the service properly, then it is diseased. Similarly, our material condition means we are in diseased condition. We are not giving service to God; we are giving service to the dog. This is our diseased condition.
So God is Himself explaining how you should live. That is Bhagavad-gītā. Therefore it is said, aśraddadhānāḥ puruṣā dharmasyāsya parantapa (BG 9.3): "My dear Arjuna, if somebody has no faith in My words . . ." Then what will be the result? The result will be, aprāpya mām: "He'll not get Me." Aprāpya means "not getting Myself." Then what he will get? Aprāpya māṁ nivartante: "Again he goes back." Instead of going back to home, back to Godhead, he goes back to where? Now, mṛtyu-saṁsāra-vartmani (BG 9.3): "Again in the cycle of birth and death." Again cycle of birth and death. Suppose in this human form of life you can make your life so perfect that immediately after death, after giving up this body, you go back to home, back to Godhead. You regain your eternal life. But if you misuse this human form of life, do not endeavor for going back to home, back to Godhead, then again go back to the cycle of birth and death. This is nature's law. You are not independent. Nature is working like that.