Caitanya Mahāprabhu is representing Himself as the chief man of the fools and rascals, and He says that, "My Guru Mahārāja, My spiritual master, ordered Me that 'You better chant Hare Kṛṣṇa. That will make You happy and progressive. That will make You one day understand what is Vedānta.' " 'Kṛṣṇa-mantra' haite habe saṁsāra-mocana (CC Adi 7.73).
Now one may question, "Oh, Vedānta-sūtra, understanding Vedānta-sūtra, one is liberated from this material entanglement? So you are asking me simply to chant Hare Kṛṣṇa? Will that purpose be served?" Oh, His guru said: "Yes, it will be served." He said: kṛṣṇa-mantra haite habe saṁsāra-mocana: "If You go on, continue this Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare / Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare, there will be a day when You come to the perfectional stage. Then You will be liberated." The same result as one gets out of studying Vedānta philosophy or Sāṅkhya philosophy, the same result also you will get by simply by chanting Hare Kṛṣṇa, Hare Kṛṣṇa. Kṛṣṇa-nāma haite pābe kṛṣṇera caraṇa.
"Not only that, the Vedāntists, sometimes they cannot reach up to the Kṛṣṇa planet. But Your advantage will be that You'll not only be liberated, but You will be achieving the highest planet, planetary kingdom, or the kingdom of God, You'll be able to achieve there."
And nāma vinu. Nāma vinu kali-kāle nāhi āra dharma (CC Adi 7.74). Now Caitanya Mahāprabhu explained that, "This Hare Kṛṣṇa, Hare Kṛṣṇa is the only universal religious principle in this age." No other religion process will be effective, because people are so many and diverted in different way. This is the common formula and this is the effective formula. So Caitanya Mahāprabhu says, nāma vinu kali-kāle: "Without chanting this Hare Kṛṣṇa, there is no other alternative for self-realization in this age of Kali."