If a thousand suns were to raise in the heavens at the same time, the blaze of their light would resemble the splendor of that supreme spirit. (Bhagavad Gita 11:12)
The Bhagavad Gita was written between 400 BCE and 200 CE. The authorship of the Bhagavad Gita is unclear. The credit for this text is traditionally given to the sage Vyasa, who is more of a legend than an actual historical figure.
In the Bhagavad Gita Krishna explains several ways of selfrealisation : The yogic paths of devotional service (bhakti), action (karma) , meditation (dhyana), and knowledge (jnana).
As answer to Arjuna's confusion and moral dilemma Krishna explains to him his duties of a warrior and prince, and he elaborates on a number of different Yogic and Vedantic philosophies, with examples and analogies.
Krishna reveals his identity as the Supreme Being Himself (Bhagavan), blessing Arjuna with an awe-inspiring glimpse of His divine absolute form.
In many ways seemingly a heterogeneous text, the Gita reconciles many facets and schools of Hindu philosophy, including those of Brahmanical (orthodox Vedic) origin and the parallel ascetic and Yogic traditions.
* The gita teaches the old samkha-philosophy and therefore not the whole troth :
20. Know thou that Purusha (the Soul) and Prakriti (Nature) are both without origin and eternal; but the modes of Nature and the lower forms she assumes to our conscious experience have an origin in Prakriti (in the transactions of these two entities).
: Only the Ishvara and Sadashiva above him are immortal !
* Krishna as (unclear) inkarnation of Vishnu is surely not the highest lord.
The Gita has therefore been criticised in the Bhagavata-Purana and also by Sri Aurobindo.
Chapter 7 - 12: BHAKTI YOGA, THE YOGA OF DEVOTION: The individual soul realizes itself the Original Soul through devotion.
Chapter 1: The Yoga of DejectionOn the confrontation with the necessity to fight.
Chapter 2a (2.1-2.38): The Yoga of Analytic KnowledgeOn the knowledge of the soul.
Chapter 2b (2.39-2.72): The Yoga of Analytic KnowledgeOn the results of labor.
Chapter 3: The Yoga of ActionOn mastering the intelligence.
Chapter 4: The Yoga of KnowledgeOn sacrificing.
Chapter 5: The Yoga of Work in DetachmentAbout the reality of detachment.
Chapter 6: The Yoga of MeditationAbout the nature of yoga and reïncarnation
Chapter 13 - 18: JÑÂNA YOGA, DE YOGA OF SPIRITUAL KNOWLEDGE: The individual soul realizes itself the Original Soul through knowledge.
Chapter 7: The Yoga of WisdomAbout knowing and realizing oneself
Chapter 8: The Yoga of the Imperishable SpiritAbout salvation
Chapter 9: The Yoga of ConfidentialityOn the confidential of knowledge
Chapter 10: The Yoga of His OpulenceOn His Identity
Chapter 11: The Yoga of the Universal FormOn the confrontation with the complete of His reality
Chapter 12: The Yoga of DevotionOn fixing oneself on the ultimate of perfection
Chapter 13: The Yoga of DiscriminationOn the difference between the knower and the known
Chapter 14: The Yoga of the Three Modes of natureOn the inherent qualities of material nature
Chapter 15: The Yoga of the Supreme PersonAbout the realization of the characteristics, virtue and glory of God
Chapter 16: The Yoga of discriminating the qualities of the enlightened and the unenlightenedAbout the qualities of the divine and the godless
Chapter 17: De Yoga of the Threefold Division of FaithAbout the nature of each type of food intake, austerity and sacrifice.
Chapter 18a: The Yoga of liberation through RenunciationAbout renunciation and its threefold nature.
Chapter 18b: The Yoga of liberation through RenunciationAbout renunciation (its threefold nature) and its service with the divisions of society as the ultimate of liberation.