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)

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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).

The text of the Gita is written in the form of a conversation between Krishna and Arjuna on the battlefield of Kurukshetra just before the start of the Kurukshetra war.

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.

It comprises primarily vedic (as in the four Vedas), as opposed to the Upanishads and Vedanta, upanishadic, Sankhya and Yogic philosophies.

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* The gita teaches  the old samkha-philosophy and therefore not the whole truth :  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).

Chapter 16 culminates in ' Hypocrisy and pride and arrogance, a harsh nature, anger, ignorance also with the one who was born to demon lot. Lot of gods leads to redemption, lot of demons to bondage! Do not mourn, for you were born to the gods lot, Pându son! , So it is the lot of gods that leads to redemption and thus determination ....

Also the Padma-Purana speaks of Krishna as Parameshvara. But : Only the Ishvara and Sadashiva above him are immortal !  Krishna as (unclear) inkarnation of Vishnu  is surely not the highest lord. This is pure Vishnuism, in which Shiva is put down.

The Gita  has therefore been criticised in the Bhagavata-Purana and also by Sri Aurobindo und M. Brück.

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Chapter 1-6: KARMA YOGA, THE YOGA OF PERFECT ACTION: The individual soul realizes itself the Original Soul through action.