Samkhya Pravachana Sutra
The Samkhya Pravachana Sutra () is a collection of major Sanskrit texts of the Samkhya school of Hindu philosophy. It includes the ancient Samkhya Sutra of Kapila, Samkhya karika of Ishvarakrishna, Samkhya Sutra "Vritti" of Aniruddha, the "Bhasya" (commentary) of Vijnana Bhikshu, the Vrittisara of Vedantin Mahadeva, Tattva Samasa and commentary of Narendra, and works of Gaudapada, Vachaspati Mishra, and Panchashikha. The text provides foundational doctrines of one of the influential schools of Hindu philosophy, such as "nothing can come out of nothing, and nothing can altogether vanish out of existence" in its doctrine of "Sat-Karya-Siddhanta , a debate on the two theories for the origin of the world - the creationists (Abhava Utpatti") and the evolutionists ("Vivarta", changing from one state to another), the doctrine of "Parinama" (transformation), among others. Samkhya Pravachana Sutra is also known as Samkhya Sutra. Contents. It describes the philosophy of the Samkhya school. The edition that survives in modern times is dated to the 14th century. The text consists of six chapters. The first three describe core Samkhya doctrines, the fourth chapter describes stories for illustration of the doctrines, the fifth reviews arguments and challenge by rival Indian philosophies particularly Buddhism on  one side and Theistic philosophy on the other side, then provides its analysis and answers to those challenges. The last chapter recapitulates its thesis, summarizes its main points and makes conclusions. Major sections and thesis presented in the text include (not exhaustive): The most important commentary on the text is ’s ' (16th century). Other important commentaries on this text include Anirruddha's ' (15th century), ’s ' (c. 1600) and ’s '.