How Vedas Came Into Existence

Vyasa Maharshi divided the single Vedic corpus into four parts - Rigveda, Yajurveda, Sama Veda, and Atharva Veda. He was expecting that in Kali-yuga people would have less intellectual capacity. Very few would be able to learn the entire Veda. He divided Veda in line with the utility of mantras during yajna. 

Scriptures say that Vedas came out when Paramatma exhaled at the beginning of creation. They were vibrations with which Brahma created both matter and energy. Then they were revealed to about 400 Rishis in an audible form.

Vedas are preserved through the tradition of oral chanting. The students listen to their teacher and repeat after him as per a well-designed curriculum. Nowadays, Vedas are available as manuscripts, printed books, and digital media.

The authenticity of the Vedas is ensured by its transmission down generations by the oral tradition of guru-shishya parampara. The Vedic principles pertaining to science such as Astronomy are corroborated by modern research.

Vedas tell us about how the universe was created and how it functions. They also tell us how humanity should shape itself to fit into the divine order.

Vedas say that there is only one supreme God called Brahman or Paramatma. This one reality is addressed by several names such as Narayana, Shiva, and Ganapathy. They are all manifestations of the same God.

Vedas are the primary and authoritative scriptures of Hinduism. Every other text such as the Itihasas, Puranas, and Dharma Shastras is based on Vedic principles. Any text that does not conform to the Vedic principles does not have authority in Hinduism.