In the unfolding of time, the creators of the various branches of knowledge and the causes behind their divisions came into being. The Vedic tradition, originating from Prajapati, is eternal and unchanging, while the alternative traditions that arose are known as the Smritis. In each Dvapara Yuga, it is said, further divisions of the Vedas were made, and once these sacred texts were imparted to their disciples, the teachers themselves undertook great austerities and retreated to the forests. The four Vedas, along with their auxiliary disciplines, Mimamsa, and the vast field of Nyaya, were established. Ayurveda, the science of life; Dhanurveda, the science of warfare; and Gandharvaveda, the art of music—these three too were set forth. The Brahmarshis, the seers who realized Brahman, were the first to arise, and from them came the Devarshis. Among these great sages were the Kashyapas, Vashishthas, Bhargavas, Angiras, and Atris. Because their minds were fixed on the contemplation of Brahman, they came to be known as Brahmarshis. There was also the deity Pratyusha and the sage Kashyapa. Among the divine sages, the sons of Dharma, Nara and Narayana, are renowned. Kubera, Paulastya, and the son of Pratyusha’s line are also counted among them. From these beings, the Vedas themselves arose, and so they are remembered as Devarshis. Those who descend from the lineage of Ikshvaku are known as Rajarshis, royal sages. Those established in Brahmaloka are remembered as pure Brahmarshis, while those who dwell in Indraloka are considered Rajarshis. All these Brahmarshis and Devarshis, together with their knowledge of past, future, and present, are steadfast in truth. They are known for their austerities, and some even declared knowledge while still in the womb. These royal sages, who are virtuous and both divine and human kings, are remembered along with the seven sages, each endowed with seven qualities. Enlightened and directly perceiving dharma, they are the originators of lineages. Their actions were impartial and blameless, and they lived as wise householders, often dwelling in forest hermitages. It was these sages who first established the arrangement of the classes and the stages of life. They set all the classes and stages of life in motion, ensuring the proper order of society. Sometimes, a father would be reborn as a son, and a son likewise as a father, continuing the sacred lineages. Eighty-eight thousand householders are said to exist, those who have wives and perform fire rituals, remembered as the progenitors of future generations. Another eighty-eight thousand are established in the northern regions. At the end of each age, new creators of mantras and Brāhmaṇa texts are born—those who compose the scriptures of the epochs and the sciences of the Vedas. In the interval of Vaivasvata, and in each Dvapara Yuga, this process repeats again and again. In the seventh Dvapara, Svayambhū himself divided the Vedas. In the third Dvapara, Ushanas became the Vyasa, in the fourth, Brihaspati, and in the seventh, Indra took this role, while Vashishtha is remembered as Vyasa in the eighth. In the eleventh Dvapara, for three years, Sanadvāja arose. In the fifteenth, Traiyyāruṇi took the role, and in the sixteenth, Dhanañjaya. From Ṛjīṣa came Bharadvāja, and from Bharadvāja, Gautama. From Haryavana, Vena is remembered, and from Vena came Vājaśravā. Thus, through the ages, the wisdom of the Vedas and the lineages of the great sages continued, ever-renewing the sacred knowledge for the benefit of the world.