Mahabharata 12.327.63

12.327.63

ayaṃ kriyāvatāṃ panthā vyaktībhūtaḥ sanātanaḥ |
aniruddha iti prokto lokasargakaraḥ prabhuḥ || 63 ||

Marichi, Angiras, Atri, Pulastya, Pulaha, Kratu, and Vasishtha,--these seven Rishis have been created by a fiat of the will. These will become the foremost of persons conversant with the Vedas. In fact, they will become the preceptors of the Vedas. They will be wedded to the religion of Pravritti, for they have been intended to devote themselves to the act of procreating offspring. This is the eternal path that I disclose of creatures engaged in acts and observances. The puissant Lord who is charged with the creation of all the worlds is called Aniruddha, Sana, Sanatsujata, Sanaka, Sanandana, Sanatkumara, Kapila, and Sanatana numbering the seventh,--these seven Rishis are known as the spiritual sons of Brahman. Their knowledge comes to them of itself (without being dependant on study or exertion). These seven are wedded to the religion of Nivritti. They are the foremost of all persons conversant with Yoga. They are possessed also of deep knowledge of the Sankhya philosophy. They are preceptors of the scriptures on duty and it is they that introduce the duties of the religion of Nivritti and cause them to flow in the worlds. From Unmanifest (Prakriti) has flowed Consciousness and the three great attributes (of Sattwa, Rajas, and Tamas). Transcending Prakriti is he called Kshetrajna. That Kshetrajna is myself. The path of those that are wedded to Karma emerging out of Ahankara is fraught with return. One cannot, by that path, reach the spot whence there is no return.