In the sutras, jhāna is entered when one ‘sits down cross-legged and establishes mindfulness’. According to Buddhist tradition, it may be supported by ānāpānasati, mindfulness of breathing, a core meditative practice which can be found in almost all schools of Buddhism. The Suttapiṭaka and the Agamas describe four stages of rūpa jhāna. Rūpa refers to the material realm, in a neutral stance, as different from the kāma-realm (lust, desire) and the arūpa-realm (non-material realm).[33] While interpreted in the Theravada-tradition as describing a deepening concentration and one-pointedness, originally the jhānas seem to describe a development from investigating body and mind and abandoning unwholesome states, to perfected equanimity and watchfulness,[34] an understanding which is retained in Zen and Dzogchen.[35][34] The stock description of the jhānas, with traditional and alternative interpretations, is as follows:[34][note 2]
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- First jhāna:Separated (vivicceva) from desire for sensual pleasures, separated (vivicca) from [other] unwholesome states (akusalehi dhammehi, unwholesome dhammas[36]), a bhikkhu enters upon and abides in the first jhana, which is [mental] pīti (“rapture,” “joy”) and [bodily] sukha (“pleasure”) “born of viveka” (traditionally, “seclusion”; alternatively, “discrimination” (of dhamma’s)[37][note 3]), accompanied by vitarka-vicara (traditionallly, initial and sustained attention to a meditative object; alternatively, initial inquiry and subsequent investigation[40][41][42] of dhammas (defilements[43] and wholesome thoughts[44][note 4]); also: “discursive thought”[note 5]).
- Second jhāna:Again, with the stilling of vitarka-vicara, a bhikkhu enters upon and abides in the second jhana, which is [mental] pīti and [bodily] sukha “born of samadhi” (samadhi-ji; trad. born of “concentration”; altern. “knowing but non-discursive […] awareness,”[6] “bringing the buried latencies or samskaras into full view”[52][note 6]), and has sampasadana (“stillness,”[53] “inner tranquility”[50][note 7]) and ekaggata (unification of mind,[53] awareness) without vitarka-vicara;
- Third jhāna:With the fading away of pīti, a bhikkhu abides in upekkhā (equanimity,” “affective detachment”[50][note 8]), sato (mindful) and [with] sampajañña (“fully knowing,”[54] “discerning awareness”[55]). [Still] experiencing sukha with the body, he enters upon and abides in the third jhana, on account of which the noble ones announce, “abiding in [bodily] pleasure, one is equanimous and mindful”.
- Fourth jhāna:With the abandoning of [the desire for] sukha (“pleasure”) and [aversion to] dukkha (“pain”[56][55]) and with the previous disappearance of [the inner movement between] somanassa (“gladness,”[57]) and domanassa (“discontent”[57]), a bhikkhu enters upon and abides in the fourth jhana, which is adukkham asukham (“neither-painful-nor-pleasurable,”[56] “freedom from pleasure and pain”[58]) and has upekkhāsatipārisuddhi (complete purity of equanimity and mindfulness).[note 9]
This excerpt comes from the Wikipedia entry on samadhi, which is really very good and worth reading in full. This entry and the description just above are detailed descriptions of meditative states which lead to full enlightenment in Buddhist and other traditions that revere samadhi states. This deep capacity of the human mind to realize enlightenment through directed concentration is all but nonexistent in modern Western thought, a momentous omission. In the Nagara Sutta, the Buddha refers to the Noble Eightfold Path, the last element of which is samadhi, as ancient, showing that Buddhism and other samadhi traditions date back millennia before the time of the Buddha, roughly 500 BC. Buddhism is a deep Indo-Aryan tradition and as such has roots shared by ancient Greece, Egypt, and Rome as well as India and most of Asia. I believe it is helpful to recognize the antiquity of samadhi and jhāna practices as well as the civilizations associated with these practices which still exist today. In this respect, Buddhism is an extremely old and pristine core tradition belonging directly to most of the world’s peoples via tradition and indirectly to all of them via efficacy and reasonableness. ABN
American Buddhist Net 