So Bhagavad-gītā is not very high class Vedic literature. It is just the entrance, ABCD of Vedic literature. ABCD, entrance. Just like matriculation examination, school-leaving examination, then you enter into college, and then get your graduate, become a graduate, and then post-graduate, so the Bhagavad-gītā is just entrance for, entrance examination for spiritual education. It is not very... It is written for the common men, common men, common men, householders, less intelligent men, woman class, like that.
And originally the Veda is one, Yajur Veda. And because it was very difficult to understand... Veda was spoken by Lord Himself to Brahmā. So seeing, foreseeing the condition of the present age, Vyāsadeva divided four Vedas, one Veda into four. The original Veda is Yajur Veda. Then he divided into Sāma, Yajur, Ṛk, Atharva. Then again the Vedic literatures were explained in Purāṇas, eighteen Purāṇas. Then Mahābhārata. Then again he summarized all the Vedic knowledge into Vedānta-sūtra, Vedānta-sūtra, summarized. Then again the Vedānta-sūtra is explained by Śrīmad-Bhāgavatam. These are the all Vedic literature. When you read this book, in the preliminary, those who have got books, you will find all this description.
So Kṛṣṇa, for understanding of the common people, the highest truth of Vedic literature, the highest truth of Vedic literature is Kṛṣṇa, and nothing else. You will find in the Bhagavad-gītā the Lord says, vedaiś ca sarvair aham eva vedyaḥ (BG 15.15). The whole purpose of Veda is to understand Me. That's all. If one has understood Kṛṣṇa, then he has understood all Vedic literature. He has nothing to understand anymore. He has passed all examination. Vedaiś ca sarvair aham eva vedyo vedānta-kṛd veda-vid eva cāham.