There is spiritual world. Kṛṣṇa says in the Bhagavad-gītā that paras tasmāt tu bhāvaḥ anyaḥ: (BG 8.20) "There is another bhāva, nature." What is the nature? Sarveṣu naśyatsu na vinaśyati: "When the material world, this cosmic manifestation, the phenomenal world, will be finished, that will stay. That will not be finished." There are many example. Just like mirage in the desert. Sometimes you see there is vast mass of water in the desert. The animal runs after the water, being thirsty, but there is no water. Therefore the animal dies. But human being should not be like the animal. They should raise their standard. They have got special consciousness. They can raise their standard of understanding by these literatures, Vedic literatures given by God. Vyāsadeva is incarnation of Kṛṣṇa, so he has given us the Vedic literature. Therefore his name is Vedavyāsa, incarnation of God, Vedavyāsa. Mahā-muni-kṛte kiṁ vā paraiḥ. There is no need of speculating. Just follow Vyāsadeva in the disciplic succession. Vyāsadeva's disciple is Nārada Muni. Nārada Muni's disciple is Vyāsadeva. So in this paramparā system: if we receive knowledge, then that is perfect knowledge. So we have to accept it. Niścayātmikā.
Therefore Rūpa Gosvāmī says that spiritual life can be advanced, the first principle is utsāha. Utsāhāt. Utsāha means enthusiasm: "Yes, Kṛṣṇa says, sarva-dharmān parityajya mām ekaṁ śaraṇaṁ vraja (BG 18.66). I will accept it and work enthusiastically on the principle, as Kṛṣṇa says." Kṛṣṇa says, man-manā bhava mad-bhakto mad-yājī māṁ namaskuru (BG 18.65), and we have to do it, execute it enthusiastically: "Yes, I shall always think of Kṛṣṇa." Man-manāḥ. Kṛṣṇa says directly. Man-manā bhava mad-bhaktaḥ, "You just become My devotee." So we have to be enthusiastic, "Yes, I shall become Kṛṣṇa's devotee." Man-manā bhava mad-bhakto mad-yājī. Kṛṣṇa says, "Worship Me," so we should be very much enthusiastic to worship Kṛṣṇa, offer maṅgala-ārātrika, rise early in the morning. These are all enthusiasm, utsāha. Those who are not enthusiastic—lazy, lethargetic—they cannot advance in spiritual life. Simply sleeping, they cannot make. One must be very, very enthusiastic, positive. Utsāhād dhairyāt. Dhairya means patience, not that "Because I have begun devotional service with great enthusiasm..." So you are already on the perfectional platform, but if you become impatient that "Why I am not becoming perfect? Sometimes why māyā is kicking me?" Yes. That is habitual. That will go on. It will stop. Niścayāt. Dhairyāt, niścayāt, that "When Kṛṣṇa says, sarva-dharmān parityajya mām ekaṁ śaraṇaṁ vraja (BG 18.66), now I have given up everything. I have no other occupational duties. Simply to serve Kṛṣṇa. So when I have taken to it, then niścaya, Kṛṣṇa will surely give me protection." That is called niścaya. Don't be disappointed. Kṛṣṇa is not a false speaker. He says, ahaṁ tvāṁ sarva-pāpebhyo mokṣayiṣyāmi.