Bhagavad-gītā is the widely read theistic science summarized in the Gītā-māhātmya (Glorification of the Gītā). There it says that one should read Bhagavad-gītā very scrutinizingly with the help of a person who is a devotee of Śrī Kṛṣṇa and try to understand it without personally motivated interpretations. The example of clear understanding is there in the Bhagavad-gītā itself, in the way the teaching is understood by Arjuna, who heard the Gītā directly from the Lord. If someone is fortunate enough to understand Bhagavad-gītā in that line of disciplic succession, without motivated interpretation, then he surpasses all studies of Vedic wisdom, and all scriptures of the world. One will find in the Bhagavad-gītā all that is contained in other scriptures, but the reader will also find things which are not to be found elsewhere. That is the specific standard of the Gītā. It is the perfect theistic science because it is directly spoken by the Supreme Personality of Godhead, Lord Śrī Kṛṣṇa.
(Bhagavad-Gita------1:1------purport).

Pure devotees are not desirous of any material enjoyment, nor are they averse to it. They completely dovetail their desires with the desires of the Lord and perform nothing on their personal account. Arjuna is a good example. On his own sentiment, due to family affection, Arjuna did not want to fight, but finally, after hearing Śrīmad Bhagavad-gītā, he agreed to fight in the interests of the Lord. Therefore, the Lord is very much satisfied with pure devotees because they do not act for sense gratification but only in terms of the Lord's desire. As Paramātmā, or Supersoul, He is situated in everyone's heart, always giving everyone the chance of good counsel. Thus everyone should take the opportunity and render transcendental loving service to Him wholly and solely.
(Srimad Bhagavatam------3:9:12------purport).

To practice the regulative principles of bhakti-yoga one should, under the guidance of an expert spiritual master, follow certain principles: one should rise early in the morning, take bath, enter the temple and offer prayers and chant Hare Kṛṣṇa, then collect flowers to offer to the Deity, cook foodstuffs to offer to the Deity, take prasādam, and so on. There are various rules and regulations which one should follow. And one should constantly hear Bhagavad-gītā and Śrīmad-Bhāgavatam from pure devotees. This practice can help anyone rise to the level of love of God, and then he is sure of his progress into the spiritual kingdom of God. This practice of bhakti-yoga, under the rules and regulations, with the direction of a spiritual master, will surely bring one to the stage of love of God.
(Bhagavad-Gita------12:9------purport).

Every word we hear has a meaning behind it. As soon as we hear the word "water," there is a substance—water—behind the word. Similarly, as soon as we hear the word "God," there is a meaning to it. If we receive that meaning and explanation of "God" from God Himself, then it is perfect. But if we speculate about the meaning of "God," it is imperfect. Bhagavad-gītā, which is the science of God, is spoken by the Personality of Godhead Himself. This is perfect knowledge. Mental speculators or so-called philosophers who are researching what is actually God will never understand the nature of God. The science of God has to be understood in disciplic succession from Brahmā, who was first instructed about knowledge of God by God Himself. We can understand the knowledge of God by hearing Bhagavad-gītā from a person authorized in the disciplic succession.
(Srimad Bhagavatam------3:26:33------purport).

Vedic knowledge is called śruti, learning by aural reception. One should actually receive the Vedic message from authorities like Kṛṣṇa and His representatives. Here Kṛṣṇa distinguishes everything very nicely, and one should hear from this source. Simply to hear like the hogs is not sufficient; one must be able to understand from the authorities. It is not that one should simply speculate academically. One should submissively hear from Bhagavad-gītā that these living entities are always subordinate to the Supreme Personality of Godhead. Anyone who is able to understand this, according to the Supreme Personality of Godhead, Śrī Kṛṣṇa, knows the purpose of the Vedas; no one else knows the purpose of the Vedas.
(Bhagavad-Gita------15:19------purport).

The process of meditating on the form of the Supreme Personality of Godhead within oneself and the process of chanting the glories and pastimes of the Lord are the same. The only difference is that hearing and fixing the mind on the pastimes of the Lord is easier than visualizing the form of the Lord within one's heart because as soon as one begins to think of the Lord, especially in this age, the mind becomes disturbed, and due to so much agitation, the process of seeing the Lord within the mind is interrupted. When there is sound vibrated praising the transcendental pastimes of the Lord, however, one is forced to hear. That hearing process enters into the mind, and the practice of yoga is automatically performed. For example, even a child can hear and derive the benefit of meditating on the pastimes of the Lord simply by listening to a reading from the Bhāgavatam that describes the Lord as He is going to the pasturing ground with His cows and friends. Hearing includes applying the mind. In this age of Kali-yuga, Lord Caitanya has recommended that one should always engage in chanting and hearing Bhagavad-gītā. The Lord also says that the mahātmās, or great souls, always engage in the process of chanting the glories of the Lord, and just by hearing, others derive the same benefit. Yoga necessitates meditation on the transcendental pastimes of the Lord, whether He is standing, moving, lying down, etc.
(Srimad Bhagavatam------3:28:19------purport).

In the sixty-seventh verse of this chapter, the Lord explicitly forbade the Gītā's being spoken to those who are envious of the Lord. In other words, Bhagavad-gītā is for the devotees only. But it so happens that sometimes a devotee of the Lord will hold open class, and in that class not all the students are expected to be devotees. Why do such persons hold open class? It is explained here that although not everyone is a devotee, still there are many men who are not envious of Kṛṣṇa. They have faith in Him as the Supreme Personality of Godhead. If such persons hear from a bona fide devotee about the Lord, the result is that they become at once free from all sinful reactions and after that attain to the planetary system where all righteous persons are situated. Therefore simply by hearing Bhagavad-gītā, even a person who does not try to be a pure devotee attains the result of righteous activities. Thus a pure devotee of the Lord gives everyone a chance to become free from all sinful reactions and to become a devotee of the Lord.
(Bhagavad-Gita------18:71------purport).

The best example of nirvāṇa is cited in Bhagavad-gītā. In the beginning the mind of Arjuna deviated from Kṛṣṇa's. Kṛṣṇa wanted Arjuna to fight, but Arjuna did not want to, so there was disagreement. But after hearing Bhagavad-gītā from the Supreme Personality of Godhead, Arjuna dovetailed his mind with Kṛṣṇa's desire. This is called oneness. This oneness, however, did not cause Arjuna and Kṛṣṇa to lose their individualities. The Māyāvādī philosophers cannot understand this. They think that oneness necessitates loss of individuality. Actually, however, we find in Bhagavad-gītā that individuality is not lost. When the mind is completely purified in love of Godhead, the mind becomes the mind of the Supreme Personality of Godhead. The mind at that time does not act separately, nor does it act without inspiration to fulfill the desire of the Lord. The individual liberated soul has no other activity. pratinivṛtta-guṇa-pravāhaḥ. In the conditioned state the mind is always engaged in activity impelled by the three modes of the material world, but in the transcendental stage, the material modes cannot disturb the mind of the devotee. The devotee has no other concern than to satisfy the desires of the Lord. That is the highest stage of perfection, called nirvāṇa or nirvāṇa-mukti. At this stage the mind becomes completely free from material desire.
(Srimad Bhagavatam------3:28:35------purport).

The Lord was acting as the spiritual master of Arjuna. Therefore it was His duty to inquire from Arjuna whether he understood the whole Bhagavad-gītā in its proper perspective. If not, the Lord was ready to re-explain any point, or the whole Bhagavad-gītā if so required. Actually, anyone who hears Bhagavad-gītā from a bona fide spiritual master like Kṛṣṇa or His representative will find that all his ignorance is dispelled. Bhagavad-gītā is not an ordinary book written by a poet or fiction writer; it is spoken by the Supreme Personality of Godhead. Any person fortunate enough to hear these teachings from Kṛṣṇa or from His bona fide spiritual representative is sure to become a liberated person and get out of the darkness of ignorance.
(Bhagavad-Gita------18:72------purport).

One who offers prayers to the Lord to fulfill his different desires must know that the highest perfectional fulfillment of desire is to go back home, back to Godhead. In this verse it is indicated that those who remember the activities of the Pracetās, the sons of King Prācīnabarhiṣat, will be delivered and blessed. So what to speak of the sons of King Prācīnabarhiṣat, who are directly connected with the Supreme Personality of Godhead? This is the way of the paramparā system. If we follow the ācāryas, we attain the same benefit as our predecessors. If one follows the decisions of Arjuna, he should be considered to be directly hearing Bhagavad-gītā from the Supreme Personality of Godhead. There is no difference between hearing Bhagavad-gītā directly from the Supreme Lord and following a personality like Arjuna, who formerly heard Bhagavad-gītā directly from the Lord. Sometimes foolish people argue that since Kṛṣṇa is not present at the moment, one cannot take direct instructions from Him. Such foolish people do not know that there is no difference between directly hearing Bhagavad-gītā and reading it, as long as one accepts Bhagavad-gītā as it is, spoken by the Lord. However, if one wants to understand Bhagavad-gītā by his imperfect interpretations, one cannot possibly understand the mysteries of Bhagavad-gītā, even though one may be a great scholar according to mundane estimation.
(Srimad Bhagavatam------4:30:10------purport).

The most effective method for directing humanity toward a positive and favorable consciousness is available in India. Any person, under any circumstances, can reach an elevated state of consciousness by properly hearing the Bhagavad-gītā, and then, by constantly chanting the name of God, he can win God over. The present state of world affairs is full of foreboding, strife, and struggle. These are the effects of Kali-yuga. But our faith in the eternal nature of jīva prompts us to believe that anyone can attain devotional service to Kṛṣṇa simply by hearing and chanting His name and thereby awakening his inherent dormant love for Him. We have full faith in the words of Śrīla Śukadeva Gosvāmī quoted above from the Śrīmad-Bhāgavatam—that simply by chanting the name of Kṛṣṇa one can reach His eternal kingdom.
(Renunciation through Wisdom).

Kṛṣṇa consciousness is acting according to Kṛṣṇa's order. A conditioned soul, illusioned by the external energy of matter, does not know that the Supreme Lord is the master who is full of knowledge and who is the proprietor of everything. Whatever He desires He can bestow upon His devotees; He is the friend of everyone, and He is especially inclined to His devotee. He is the controller of this material nature and of all living entities. He is also the controller of inexhaustible time, and He is full of all opulences and all potencies. The Supreme Personality of Godhead can even give Himself to the devotee. One who does not know Him is under the spell of illusion; he does not become a devotee, but a servitor of māyā. Arjuna, however, after hearing Bhagavad-gītā from the Supreme Personality of Godhead, became free from all illusion. He could understand that Kṛṣṇa was not only his friend but the Supreme Personality of Godhead. And he understood Kṛṣṇa factually. So to study Bhagavad-gītā is to understand Kṛṣṇa factually. When a person is in full knowledge, he naturally surrenders to Kṛṣṇa. When Arjuna understood that it was Kṛṣṇa's plan to reduce the unnecessary increase of population, he agreed to fight according to Kṛṣṇa's desire. He again took up his weapons—his arrows and bow—to fight under the order of the Supreme Personality of Godhead.
(Bhagavad-Gita------18:73------purport).

The material world is characterized by a struggle for existence, and survival of the fittest is a well-known principle, but the poor souls of this material world do not know what is survival and who is fit. Survival does not mean that one should die; survival means that one should not die, but should enjoy an everlastingly blissful life of knowledge. This is survival. The Kṛṣṇa consciousness movement is meant to make every person fit for survival. Indeed, it is meant to stop the struggle for existence. The Śrīmad-Bhāgavatam and Bhagavad-gītā give definite directions on how to stop the struggle for existence and how to survive in eternal life. The saṅkīrtana movement, therefore, is a great opportunity. Simply by hearing Bhagavad-gītā and chanting the Hare Kṛṣṇa mahā-mantra, one becomes completely purified. Thus the struggle for existence ceases, and one goes back home, back to Godhead.
(Srimad Bhagavatam------8:5:23------purport).

At present only a small portion of the knowledge contained in the Vedas, Vedānta-sūtra, and Upaniṣads is available to the general populace. What is noteworthy, however, is that the essence of all Vedic knowledge is available in the Gītopaniṣad, popularly known as the Bhagavad-gītā. Lord Kṛṣṇa milked the cow of the Upaniṣads, and Arjuna drank the milk thus obtained—the Bhagavad-gītā. If Arjuna found time to hear the Bhagavad-gītā in the middle of a battlefield at Kuruksetra, then what urgent business is stopping us from hearing the Gītā? When knowledge of the Gītā spreads, then everyone will easily be able to attain the platform of yoga. And as the pure devotees of the Lord become successful in their efforts to use their spiritual intelligence in the Lord's service, then the science of love of God taught by Lord Caitanya, the most magnanimous incarnation of Godhead, will be distributed everywhere. Judging from all the symptoms, the time is now ripe. Indians should now take shelter of their saintly preceptors, the pure devotees, and unitedly propagate the glorification of Kṛṣṇa via the medium of the Bhagavad-gītā. In this way the world will become prosperous and perfect. The present age has seen interest in spiritual matters markedly increase. Yoga and meditation societies have mushroomed expressly to transmit the knowledge of the Bhagavad-gītā, but how this will be accomplished is still a question. We are confident that Lord Caitanya's teachings on the process of loving devotional service will easily harmonize all conflicting concepts.
(Renunciation through Wisdom).

Vyāsa was the spiritual master of Sañjaya, and Sañjaya admits that it was by Vyāsa's mercy that he could understand the Supreme Personality of Godhead. This means that one has to understand Kṛṣṇa not directly but through the medium of the spiritual master. The spiritual master is the transparent medium, although it is true that the experience is still direct. This is the mystery of the disciplic succession. When the spiritual master is bona fide, then one can hear Bhagavad-gītā directly, as Arjuna heard it. There are many mystics and yogīs all over the world, but Kṛṣṇa is the master of all yoga systems. Kṛṣṇa's instruction is explicitly stated in Bhagavad-gītā-surrender unto Kṛṣṇa. One who does so is the topmost yogī. This is confirmed in the last verse of the Sixth Chapter. Yoginām api sarveṣām.
(Bhagavad-Gita------18:75------purport).