Bhagavad-gita As It Is
BG Chapters 1 - 6
Sañjaya said: Having spoken thus, Arjuna, chastiser of enemies, told Kṛṣṇa, "Govinda, I shall not fight," and fell silent.
Dhṛtarāṣṭra must have been very glad to understand that Arjuna was not going to fight and was instead leaving the battlefield for the begging profession. But Sañjaya disappointed him again in relating that Arjuna was competent to kill his enemies (parantapaḥ). Although Arjuna was, for the time being, overwhelmed with false grief due to family affection, he surrendered unto Kṛṣṇa, the supreme spiritual master, as a disciple. This indicated that he would soon be free from the false lamentation resulting from family affection and would be enlightened with perfect knowledge of self-realization, or Kṛṣṇa consciousness, and would then surely fight. Thus Dhṛtarāṣṭra's joy would be frustrated, since Arjuna would be enlightened by Kṛṣṇa and would fight to the end.
There are two classes of men, namely the devotee and the demon. The Lord selected Arjuna as the recipient of this great science owing to his being a devotee of the Lord, but for the demon it is not possible to understand this great mysterious science. There are a number of editions of this great book of knowledge. Some of them have commentaries by the devotees, and some of them have commentaries by the demons. Commentation by the devotees is real, whereas that of the demons is useless. Arjuna accepts Śrī Kṛṣṇa as the Supreme Personality of Godhead, and any commentary on the Gītā following in the footsteps of Arjuna is real devotional service to the cause of this great science. The demonic, however, do not accept Lord Kṛṣṇa as He is. Instead they concoct something about Kṛṣṇa and mislead general readers from the path of Kṛṣṇa's instructions. Here is a warning about such misleading paths. One should try to follow the disciplic succession from Arjuna, and thus be benefitted by this great science of Śrīmad Bhagavad-gītā.
BG Chapters 7 - 12
The unalloyed devotees of the Supreme Lord, who are totally surrendered souls, do not care when they leave their bodies or by what method. They leave everything in Kṛṣṇa's hands and so easily and happily return to Godhead. But those who are not unalloyed devotees and who depend instead on such methods of spiritual realization as karma-yoga, jñāna-yoga and haṭha-yoga must leave the body at a suitable time and thereby be assured whether or not they will return to the world of birth and death.
Here Lord Kṛṣṇa, having established that He is the only enjoyer, the primeval Lord and the real object of all sacrificial offerings, reveals what types of sacrifices He desires to be offered. If one wishes to engage in devotional service to the Supreme in order to be purified and to reach the goal of life—the transcendental loving service of God—then one should find out what the Lord desires of him. One who loves Kṛṣṇa will give Him whatever He wants, and he avoids offering anything which is undesirable or unasked. Thus meat, fish and eggs should not be offered to Kṛṣṇa. If He desired such things as offerings, He would have said so. Instead He clearly requests that a leaf, fruit, flowers and water be given to Him, and He says of this offering, "I will accept it." Therefore, we should understand that He will not accept meat, fish and eggs. Vegetables, grains, fruits, milk and water are the proper foods for human beings and are prescribed by Lord Kṛṣṇa Himself. Whatever else we eat cannot be offered to Him, since He will not accept it. Thus we cannot be acting on the level of loving devotion if we offer such foods.
A person in Kṛṣṇa consciousness, engaged in devotional service, simply by the guidance of the bona fide spiritual master, simply by offering regulative obeisances unto the Deity, simply by hearing the glories of the Lord, and simply by eating the remnants of foodstuffs offered to the Lord, realizes the Supreme Personality of Godhead very easily. There is no doubt that the impersonalists are unnecessarily taking a troublesome path with the risk of not realizing the Absolute Truth at the ultimate end. But the personalist, without any risk, trouble or difficulty, approaches the Supreme Personality directly. A similar passage appears in Śrīmad-Bhāgavatam. It is stated there that if one ultimately has to surrender unto the Supreme Personality of Godhead (this surrendering process is called bhakti), but instead takes the trouble to understand what is Brahman and what is not Brahman and spends his whole life in that way, the result is simply troublesome. Therefore it is advised here that one should not take up this troublesome path of self-realization, because there is uncertainty in the ultimate result.