It appears from the talks of Lord Caitanya that a person who cannot keep his faith in the words of the spiritual master and who acts independently cannot attain the desired success in chanting Hare Kṛṣṇa. In the Vedic literature it is stated that the import of all transcendental literature is revealed to one who has unflinching faith in the Supreme Lord and his spiritual master. Lord Caitanya firmly believed in the statements of His spiritual master, and He never neglected the instructions of His spiritual master by stopping His saṅkīrtana movement. Thus the transcendental potency of the holy name encouraged Him more and more in chanting Hare Kṛṣṇa, the mahā-mantra.
Lord Caitanya next informed Prakāśānanda that in the modern age people in general are more or less bereft of spiritual intellect. When such people come under the influence of Śaṅkarācārya's Māyāvāda (impersonalist) philosophy before beginning the most confidential Vedānta-sūtra, their natural tendency toward obedience to the Supreme is checked. The supreme source of everything is naturally respected by everyone, but this natural tendency is hampered when one takes to the impersonalist conceptions of Śaṅkara. Thus the spiritual master of Lord Caitanya suggested that it is better not to study the Śārīraka-bhāṣya of Śaṅkarācārya, for it is very harmful to people in general. Indeed, the common man does not even have the intelligence to penetrate into the jugglery of words. He is better advised to chant the mahā-mantra: Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare. In this quarrelsome Age of Kali there is no alternative for self-realization.
After hearing the arguments and talks of Caitanya Mahāprabhu, all the Māyāvādī sannyāsīs who were present became pacified and replied with sweet words: "Dear sir, what You have spoken is all true. A person who attains love of Godhead is certainly very fortunate, and undoubtedly You are very fortunate to have attained this stage. But what is the fault in the Vedānta? It is the duty of a sannyāsī to read and understand the Vedānta. Why do You not study it?"
According to Māyāvādī philosophers, the Vedānta refers to the Śārīraka commentary of Śaṅkarācārya. When impersonalist philosophers refer to the Vedānta and the Upaniṣads, they are actually referring to these works as understood through the commentaries of Śaṅkarācārya, the greatest teacher of Māyāvāda philosophy. After Śaṅkarācārya came Sadānanda Yogīndra, who claimed that the Vedānta and Upaniṣads should be understood through the commentaries of Śaṅkarācārya. Factually, this is not so. There are many commentaries on the Vedānta and the Upaniṣads made by Vaiṣṇava ācāryas, and these are preferred to those of Śaṅkarācārya. But the Māyāvādī philosophers, influenced by Śaṅkarācārya, do not attribute any importance to the Vaiṣṇava understandings.
There are four different sects of Vaiṣṇava ācāryas, and each follows a different variation of personalism—śuddhādvaita, viśiṣṭādvaita, dvaitādvaita and acintya-bhedābheda. All the Vaiṣṇava ācāryas in these schools have written commentaries on the Vedānta-sūtra, but the Māyāvādī philosophers do not recognize them. The Māyāvādīs distinguish between Kṛṣṇa and Kṛṣṇa's body, and therefore they do not recognize the worship of Kṛṣṇa by the Vaiṣṇava philosophers. Thus when the Māyāvādī sannyāsīs asked Lord Caitanya why He did not study the Vedānta-sūtra, the Lord replied, "Dear sirs, you have asked why I do not study the Vedānta, and in answer to this I could speak something, but I am afraid you would be sorry to hear it."
All the Māyāvādī sannyāsīs replied, "We shall be very much pleased to hear You because we see that You are just like Nārāyaṇa and Your speeches are so nice that we are taking great pleasure in them. We are very much obliged to see and hear You. Therefore we shall be very glad to hear patiently and accept whatever You say."
The Lord then began to speak on Vedānta philosophy as follows: The Vedanta-sūtra is spoken by the Supreme Lord Himself. The Supreme Lord, in His incarnation as Vyāsadeva, has compiled this great philosophical treatise. Since Vyāsadeva is an incarnation of the Supreme Lord, he cannot be likened to an ordinary person, who has the four defects which arise due to contact with material existence. The defects of a conditioned soul are (1) he must commit mistakes, (2) he must be illusioned, (3) he must possess the tendency to cheat others, and (4) all his senses must be imperfect. We must understand that the incarnation of God is transcendental to all these defects. Thus whatever has been spoken and written by Vyāsadeva is considered to be perfect. The Upaniṣads and Vedānta-sūtra aim at the same goal: the Supreme Absolute Truth. When we accept the direct import of the Vedānta-sūtra and Upaniṣads, that is glorious. But the commentaries made by Śaṅkarācārya are indirect and are thus very dangerous for the common man to read, for by understanding the import of the Upaniṣads in such an indirect, disruptive way, one practically bars himself from spiritual realization.
According to the Skanda and Vāyu Purāṇas, the word sūtra refers to a condensed work which carries meaning and import of immeasurable strength without any mistake or fault. The word vedānta means "the end of Vedic knowledge." In other words, any book which deals with the subject matter indicated by all the Vedas is called vedānta. For example, the Bhagavad-gītā is vedānta because in the Bhagavad-gītā the Lord says that the ultimate goal of all Vedic research is Kṛṣṇa. Thus one should understand that the Bhagavad-gītā and Śrīmad-Bhāgavatam, which aim only at Kṛṣṇa, are vedānta.
In transcendental realization there are three divisions of knowledge, called prasthāna-traya. That department of knowledge which is proved by Vedic instruction (like the Upaniṣads) is called śruti-prasthāna. Authoritative books indicating the ultimate goal and written by liberated souls like Vyāsadeva (for example, the Bhagavad-gītā, Mahābhārata and Purāṇas, especially Śrīmad-Bhāgavatam, the Mahā-Purāṇa) are called smṛti-prasthāna. From the Vedic literature we understand that the Vedas originated from the breathing of Nārāyaṇa. Vyāsadeva, who is an incarnation of the power of Nārāyaṇa, compiled the Vedānta-sūtra (nyāya-prasthāna), but according to Śaṅkara's commentaries, Apāntaratamā Ṛṣi is also sometimes credited with having compiled the aphorisms of the Vedānta-sūtra. According to Lord Caitanya, the conclusions of the verses of the Pañcarātra and the aphorisms of the Vedānta are one and the same. Since the Vedānta-sūtra is compiled by Vyāsadeva, it should be understood to be spoken by Nārāyaṇa Himself. From all the descriptive literature dealing with the Vedānta-sūtra, it appears that there were many other ṛṣis contemporary with Vyāsadeva who also discussed the Vedānta-sūtra. These sages were Ātreya, Āśmarathya, Auḍulomi, Kārṣṇājini, Kāśakṛtsna, Jaimini and Bādarī, while other sages such as Pārāśarī and Karmandī discussed the Vedānta before Vyāsadeva.
In the first two chapters of the Vedānta-sūtra the relationship between the living entities and the Supreme Lord is explained, and in the Third Chapter the discharge of devotional service is explained. The Fourth Chapter deals with the result of discharging devotional service. The natural commentary on the Vedānta-sūtra is Śrīmad-Bhāgavatam. The great ācāryas of the four Vaiṣṇava communities (sampradāyas)—namely, Rāmānujācārya, Madhvācārya, Viṣṇu Svāmī and Nimbārka—have also written commentaries on the Vedānta-sūtra by following the principles of Śrīmad-Bhāgavatam. The followers of these ācāryas, down to the present day, have written many books following the principles of Śrīmad-Bhāgavatam and accepting it as the natural commentary on the Vedānta. Śaṅkara's commentary on the Vedānta-sūtra, known as the Śārīraka-bhāṣya, is very much adored by the impersonalist scholars, but such materialistic commentaries are completely adverse to the transcendental service of the Lord. Consequently Lord Caitanya said that direct commentaries on the Upaniṣads and Vedānta-sūtra are glorious, but that anyone who follows the indirect path of Śaṅkarācārya's Śārīraka-bhāṣya is certainly doomed.