The concept of the "innate purity of the mind" (cittaprakṛtiprabhasvara) is a very important notion in the Mahayana Buddhism and has a great influence on the Chinese Buddhism. It is often used synonymously with "tathāgatagarbha" in many Mahayana texts. However, the origin of the concept can be traced back to the Āgamas and the Nikāyas. It is quite interesting to find such a concept in these sutras which vey much emphasize the concepts of impermanence and non-ego. The purpose of this study is to clarify the true meaning of this concept of the innately pure mind in the Āgamas and the Nikāyas. This paper is divided into three parts. In the first part, the original statements concerning this concept are discussed within the context of the entire collection of the Buddha's discourses. Since the formula of this concept involves the defilements of the mind, the second part of this study focuses on the types of the defilements which contaminate the mind. The analogies found in the texts discussing the defilements also help to further clarify the meaning and functions of the concept discussed in part one. As there is a lot of debate on this concept in the Abhidharma literature, the third part presents some of the debate to illuminate the issues concerning whether the mind can be truly polluted and the relationship between the mind and the defilements. In the conclusion, in addition to summing up the discussion on the true meaning of the concept of the innately pure mind in the Āgamas and the Nikāyas, the difference between its use in these sutras and that in the Tathāgatagarbha sutras is also briefly mentioned.
abhidharma - Abhidharma generally refers to the corpus of Buddhist texts which deals with the typological, phenomenological, metaphysical, and epistemological presentation of Buddhist concepts and teachings. The abhidharma teachings present a meta-knowledge of Buddhist sūtras through analytical and systemic schemas and are said to focus on developing wisdom among the three principles of training. The Abhidharma is presented alongside Sūtra and Vinaya as one of the three baskets of the teachings of the Buddha. Skt. अभिधर्म Tib. ཆོས་མངོན་པ། Ch. 阿毗达磨
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