BG Chap 18 - The essence of the Bhagavad Gītā

The Bhagavad Gītā does not favor war. Some may protest that Kṛṣṇa incited Arjuna to fight, which is immoral, but the reality of the situation is clearly stated: Bhagavad-Gītā is the supreme instruction in morality. The supreme instruction of morality is stated in the Ninth Chapter, in the thirty-fourth verse: man-manā bhava mad-bhaktaḥ. One must become a devotee of Kṛṣṇa, and the essence of all religion is to surrender unto Kṛṣṇa (sarva-dharmān parityajya mām ekaṁ śaraṇaṁ vraja). The instructions of Bhagavad-Gītā constitute the supreme process of religion and of morality. All other processes may be purifying and may lead to this process, but the last instruction of the Gītā is the last word in all morality and religion: surrender unto Kṛṣṇa. There are many methods, but among them, surrender, along with the attitude of being a servant, quickly pleases the Lord. In the Gītā, the supreme truth Kṛṣṇa, filled with all spiritual qualities, who drunk the breast milk of Yaśodā, and who became the charioteer of Arjuna, is glorified.
From Bhagavad-Gītā we can understand that to realize oneself by philosophical speculation and by meditation is one process, but to fully surrender unto Kṛṣṇa is the highest perfection. This is the essence of the teachings of Bhagavad-Gītā. The path of regulative principles according to the orders of social life and according to the different courses of religion may be a confidential path of knowledge. But although the rituals of religion are confidential, meditation and cultivation of knowledge are still more confidential. And surrender unto Kṛṣṇa in devotional service in full Kṛṣṇa consciousness is the most confidential instruction. That is the essence of the Eighteenth Chapter.