4.13 Appendix: What a man thinks, that he becomes - Sixth Prapathaka.4.12 Appendix: Self exists, it is everywhere - Sixth Prapathaka.4.11 Appendix: Yoga, Samkhya and Vaishnava doctrines - Sixth Prapathaka.4.10 Appendix: The metaphorical theory of food, of time - Sixth Prapathaka.4.9 Appendix: Types of knowledge, all gods are nothing but Self, that Self is within each human being - Sixth Prapathaka.4.8 Appendix: The symbol Om and its significance - Sixth Prapathaka.4.7 Appendix: Enumeration of Selfs - Sixth Prapathaka.4.6 Appendix: Pantheistic Self and Samkhya theory of Gunas - Fifth Prapathaka.4.5 Deity worship can be rewarding, but must be temporary, replaced with meditation and self knowledge - Fourth Prapathaka.4.4 Realization of True Self, union with Brahman - Fourth Prapathaka.4.3 Human suffering, its causes and the nature of Selfs - Third Prapathaka.4.2 Every individual has Self, which is serene, the highest light, the cosmic truth - Second Prapathaka.4.1 Meditation of Self is the essence of religious activity - First Prapathaka.The text is also notable for its practice of Anyatrapyuktam (or Ityevam Hyaha), that is being one of the earliest known Sanskrit texts that embedded quotes with credits and frequent citations to more ancient Sanskrit texts. The Maitri Upanishad is an important ancient text notable, in its expanded version, for its references to theories also found in Buddhism, elements of the Samkhya and Yoga schools of Hinduism, as well as the Ashrama system. The common kernel of the Upanishad across different recensions, states Max Muller, is a reverence for Self, that can be summarized in a few words as, "(Man) is the Self – the immortal, the fearless, the Brahman". The content and structure of the Upanishad is also different in various manuscript recensions, suggesting that the Upanishad was extensively interpolated and expanded over a period of time. However, several manuscripts discovered in different parts of India contain lesser number of Prapathakas, with a Telugu language version showing just four, and another Burnell version showing just one section. The first Prapathaka is introductory, the next three are structured in a question-answer style and discuss metaphysical questions relating to Atman (Self), while the fifth to seventh Prapathaka are supplements. The Maitrayaniya Upanishad consists of seven Prapathakas (lessons). The chronology of Maitrayaniya Upanishad is contested, but generally accepted to be a late period Upanishadic composition. It is a part of the "black" Yajurveda, with the term "black" implying "the un-arranged, motley collection" of content in Yajurveda, in contrast to the "white" (well arranged) Yajurveda where Brihadaranyaka Upanishad and Isha Upanishad are embedded. The Maitrayaniya Upanishad is associated with the Maitrayanas school of the Yajurveda. It is also known as the Maitri Upanishad ( Sanskrit: मैत्री उपनिषद्, Maitrī Upaniṣad), and is listed as number 24 in the Muktika canon of 108 Upanishads. The Maitrayaniya Upanishad ( Sanskrit: मैत्रायणीय उपनिषद्, Maitrāyaṇīya Upaniṣad) is an ancient Sanskrit text that is embedded inside the Yajurveda.