Patanjali are the current surviving valid texts, and all other surviving modern-grammatical texts should not be accepted as they are confusing, dishonest and will not help people in learning the Vedas easily. He accepted all the six Darshana Shastras which includes Samkhya, Vaisheshika, Nyaya, Yoga Sutras of Patanjali, Purva Mimamsa Sutras, Vedanta sutras. Unlike other medieval Sanskrit scholars, Dayanand said all the six darshanas are not opponents but each throw light on different aspects required by the Creation. Hence they are all independent in their own right and all of them conform with the teachings of the Vedas. He says Acharya Kapila of Sankhya Darshan was not an atheist but it is the scholars who misinterpreted his sutras. He said the books called Brahamana-Granthas such as Aitareya Brahmana, Shatapatha Brahmana, Sāma Brahamana, Gopatha Brahmana etc... which are authored by the seers to explain the meaning of the Vedas are also valid but again only to that extent as they agree with four Vedas because these texts are prone to interpolations by others. He said it is these books which are called by the names "Itihasa, Purana, Narashamsa, Kalpa, Gatha" since they contain information about life of Seers and incidents, they inform about the creation of the World etc... He said the eighteen Puranas and the eighteen Upapuranas, are not the real Puranas and these are not authored by sage Vyasa, and they violate teachings of the Vedas and therefore they should not be accepted. The eighteen Puranas and Upapuranas are filled with contradictions, idol worships, incarnations and personification of God, temples, rituals and practises which are against the Vedas. In his book Satyarth Prakash, he says whatever 'good' present in these eighteen- Puranas and upapuranas, are already present in the Vedas and since they contain too many false informations which can mislead people, they should be rejected. He points that the sage Vyasa was called so by the name "Vyasa" not because he divided the Vedas but indicates the "diameter or breadth" which means sage Veda Vyasa had studied the Vedas in great depth. He lists out various texts which should not be treated as honest texts to develop one's understanding of the World and the Lord. He rejected "all" of the Tantric texts including Pancharatra. He said that these texts are not valid as they teach different customs, rituals and practises which are against the Vedas. Maharshi Dayanand based