Kleshas (Buddhism) in the context of Jhāna

Buddhist meditation is the practice of meditation in Buddhism. The closest words for meditation in the classical languages of Buddhism are bhāvanā ("mental development") and jhāna/dhyāna (a state of meditative absorption resulting in a calm and luminous mind).

Buddhists pursue meditation as part of the path toward liberation from defilements (kleshas) and clinging and craving (upādāna), also called awakening, which results in the attainment of nirvana. The Indian Buddhist schools relied on numerous meditation techniques to attain meditative absorption, some of which remain influential in certain modern schools of Buddhism. Classic Buddhist meditations include anapanasati (mindfulness of breathing), asubha bhavana ("reflections on repulsiveness"); reflection on pratityasamutpada (dependent origination); anussati (recollections, including anapanasati), the four foundations of mindfulness, and the divine abodes (including loving-kindness and compassion). These techniques aim to develop various qualities including equanimity, sati (mindfulness), samadhi (unification of mind) c.q. samatha (tranquility) and vipassanā (insight); and are also said to lead to abhijñā (supramundane powers). These meditation techniques are preceded by and combined with practices which aid this development, such as moral restraint and right effort to develop wholesome states of mind.

Kenshō (Rōmaji; Japanese and classical Chinese: 見性, Pinyin: jianxing, Sanskrit: dṛṣṭi-svabhāva) is an East Asian Buddhist term from the Chan / Zen tradition which means "seeing" or "perceiving" (見) "nature" or "essence" (性), or 'true face'. It is usually translated as "seeing one's [true] nature," with "nature" referring to buddha-nature, ultimate reality, the Dharmadhatu. The term appears in one of the classic slogans which define Chan Buddhism: to see oneʼs own nature and accomplish Buddhahood (見性成佛).

Kenshō is an initial insight or sudden awakening, not full Buddhahood. It is to be followed by further training which deepens this insight, allows one to learn to express it in daily life and gradually removes the remaining defilements.

In the oldest texts of Buddhism, dhyāna (Sanskrit: ध्यान) or jhāna (Pāli) is a component of the training of the mind (bhāvanā), commonly translated as meditation, to withdraw the mind from the automatic responses to sense-impressions and "burn up" the defilements, leading to a "state of perfect equanimity and awareness (upekkhā-sati-parisuddhi)." Dhyāna may have been the core practice of pre-sectarian Buddhism, in combination with several related practices which together lead to perfected mindfulness and detachment.

In the later commentarial tradition, which has survived in present-day Theravāda, dhyāna is equated with "concentration", a state of one-pointed absorption in which there is a diminished awareness of the surroundings. In the contemporary Theravāda-based Vipassana movement, this absorbed state of mind is regarded as unnecessary and even non-beneficial for the first stage of awakening, which has to be reached by mindfulness of the body and vipassanā (insight into impermanence). Since the 1980s, scholars and practitioners have started to question these positions, arguing for a more comprehensive and integrated understanding and approach, based on the oldest descriptions of dhyāna in the suttas.

In Buddhist philosophy and soteriology, Buddha-nature (Chinese: fóxìng 佛性, Japanese: busshō 佛性, Vietnamese: Phật tính, Sanskrit: buddhatā, buddha-svabhāva or tathāgatagarbha तथागतगर्भ) is the innate potential for all sentient beings to become a Buddha or the fact that all sentient beings already have a pure Buddha-essence within themselves. "Buddha-nature" is the common English translation for several related Mahāyāna Buddhist terms, most notably tathāgatagarbha (तथागतगर्भ) and buddhadhātu, but also sugatagarbha, and buddhagarbha. Tathāgatagarbha can mean "the womb" or "embryo" (garbha) of the "thus-gone one" (tathāgata), and can also mean "containing a tathāgata". Buddhadhātu can mean "buddha-element", "buddha-realm", or "buddha-substrate".

Buddha-nature has a wide range of (sometimes conflicting) meanings in Indian Buddhism and later in East Asian and Tibetan Buddhist literature. Broadly speaking, it refers to the belief that the luminous mind, "the natural and true state of the mind", which is pure (visuddhi) mind undefiled by afflictions, is inherently present in every sentient being, and is eternal and unchanging. It will shine forth when it is cleansed of the defilements, that is, when the nature of mind is recognized for what it is.

Purity (Pali: Vissudhi) is an important concept within much of Theravada and Mahayana Buddhism, although the implications of the resultant moral purification may be viewed differently in the varying traditions. The aim is to purify the personality of the Buddhist practitioner so that all moral and character defilements and defects (kleśas such as anger, ignorance and lust) are wiped away and nirvana can be obtained.

The Ratnagotravibhāga (Sanskrit, abbreviated as RGV, meaning: Analysis of the Jeweled Lineage, Investigating the Jewel Disposition) and its vyākhyā commentary (abbreviated RGVV to refer to the RGV verses along with the embedded commentary), is an influential Mahāyāna Buddhist treatise on buddha-nature (a.k.a. tathāgatagarbha). The text is also known as the Mahāyānottaratantraśāstra (The Ultimate Teaching of the Mahāyāna). The RGVV was originally composed in Sanskrit, likely between the middle of the third century and no later than 433 CE. The text and its commentary are also preserved in Tibetan and Chinese translations.

The Ratnagotra focuses on the buddha nature present in all sentient beings, which is eternal, blissful, unconditioned and originally pure. This buddha nature is obscured by defilements, but when they are removed, the buddha nature is termed dharmakaya, the ultimate Buddha body. The buddha nature is what is referred to as the "jewel disposition" or "jeweled lineage" (ratnagotra) of the Buddhas. The RGVV often quotes from various tathāgatagarbha sutras and comments on them. The Ratnagotravibhāga is an important and influential text in Tibetan Buddhism and was also important for the Huayan school.