Garuda Mahā Purana - Achara Khaṇḍa
237 - Essence of the Gita
The lord said:
1. I shall narrate to you the gist of Gita mentioned to arjuna formely. A person who practise Yoga with its eight components has mastered vedantic lore.
2. The realization of Atman is the only great asset, nothing else. The Atman is devoid of physical body. It is also divested of form, colour and of the gross body, mind, eyes and the rest.
3. The Prāna is devoid of knowledge. In decp slumber I' (the knowledge of the self) is seen. This cannot be the real Atman, since the existing man is in conjunction with misery and worldly bondage
4. Just like a smokeless blazing fire, just like the lightning in the sky, the Atman shines in the inner heart.
5. The ears, etc, cannot see themselves or the Atman, But the soul the omniscient, the onlooker of all sces them.
6. The Ātman is self luminary. Due to its contact the sin is dissipated and knowledge arises in the individual soul in the manner of the screen that appears to be blazing when a light burns nearby.
7-10. Like the objects reflected in a mirror the soul sees things reflected in itself such as the sense organs, the objects, the great elements, the mind, the intellect, the ego, the unmanifest and the Puruşha. By pervading the cluster of sense organs with the mind and by fixing the mind in the ego, O Pandava, the ego in the intellect and the intellect in Prakruti, the Prakruti in the Puruşha and the Puruşha in Brahman, one realises 'I am Brahman the great Light' and realising this one becomes liberated.
11. The body is a house with nine door ways (the external apertures), three presiding deities (the three Guņas) and five witnesses (the five sense organs). The supreme presid ing officer is the Kşhetrajña (the soul). He who knows this thoroughly is the excellent poet (Kavi or Kräntadarshin i.e. a seer).
12. Thousands of horse sacrifices and hundreds of Vajapeya sacrifices do not merit even a sixteenth part of Jnana yajña (the sacrifice of knowledge).
Summary of chapter 237 of the Garuda Mahā Purana - Achara Khaṇḍa is as follows:
The Supreme Being proclaims that the Āchāra Khaṇḍa encapsulates the ultimate essence of all Vedas, Smṛtis, Āyurveda, Nīti Shāstra, and Vedānta scriptures. As it happens, Bhagavān Vishṇu reveals that all branches of knowledge exist solely to illuminate the supreme truth of Nārāyaṇa.