ya^nika = sukkha-vipassaka (q.v.).
is frequently found in the older sutta texts (e.g. A. II, 32; S. XLV, 159), also together with samatha. The 9 and 18 insight-knowledges (vipassana^-n~a^na and maha^-vipassana^), however, occur in the Sutta Pitaka only in the Pts.M., n~a^nakatha^, where they are enumerated and explained, though without any group name being attached to them.
”insight”, is the intuitive light flashing forth and exposing the truth of the impermanency, the suffering and the impersonal and unsubstantial nature of all corporeal and mental phenomena of existence. It is insight-wisdom (vipassana^-pan~n~a^) that is the decisive liberating factor in Buddhism, though it has to be developed along with the 2 other trainings in morality and concentration. The culmination of insight practice (s. visuddhi VI) leads directly to the stages of holiness (s. visuddhi VII).
Insight is not the result of a mere intellectual understanding, but is won through direct meditative observation of one”s own bodily and mental processes. In the commentaries and the Vis.M., the sequene in developing insight-meditation is given as follows: 1. discernment of the corporeal (rúpa), 2. of the mental (na^ma), 3. contemplation of both (na^marúpa; i.e. of their pairwise occurrence in actual events, and their interdependence), 4. both viewed as conditioned (application of the dependent origination, paticcasamuppa^da), 5. application of the 3 characteristics (impermanency, etc.) to mind-and-body-cum-conditions.
The stages of gradually growing insight are described in the 9insight- knowledges (vipassana^-n~a^na), constituting the 6th stage of purification: beginning with the ”knowledge of rise and fall” and ending with the ”adaptation to Truth”. For details, see visuddhi VI and Vis.M. XXI.
Eighteen chief kinds of insight-knowledge (or principal insights, maha^-vipassana^) are listed and described in Vis.M. XXII, 113: (1) contemplation of impermanence (anicca^nupassana^), (2) of suffering (dukkha^nupassana^), (3) of no self (anatta^nupnupassana^), (4) of aversion (nibbida^nupassana^). (5) of detachment (vira^ga^nupassana^), (6) of extinction (nirodha^nupassana^), (7) of abandoning (patinissagga^nupassana^), (8) of waning (khaya^nupassana^), (9) of vanishing (vaya^nupassana^), (10) of change (viparina^ma^nupassana^), (11) of the unconditioned (or signless, animitta^nupassana^), (12) of desirelessness (apanihita^nupassana^), (13) of emptiness (sun~n~ata^upassana^), (14) insight into phenomena which is higher wisdom (adhipan~n~a^-dhamma-vipassana^), (15) knowledge and vision according to reality (yatha^-bhúta-n~a^nadassana), (16) contemplation of misery (or danger, a^di^nava^nupassana^), (17) reflecting contemplation (patisankha^nupassana^), (18) contemplation of turning away (vivattana^nupassana^).
Through these 18, the adverse ideas and views are overcome, for which reason this way of overcoming is called ”overcoming by the opposite” (tadanga-paha^na, overcoming this factor by that). Thus (1) dispels the idea of permanence. (2) the idea of happiness, (3) the idea of self, (4) lust, (5) greed, (6) origination, (7) grasping, (8) the idea of compactness, (9) karma-accumulation, (10) the idea of lastingness, (11) the conditions, (12) delight, (13) adherence, (14) grasping and adherence to the idea of substance, (15) attachment and adherence, (17) thoughtlessness, (18) dispels entanglement and clinging.
Insight may be either mundane (lokiya, q.v.) or supermundane (lokuttara, q.v.). Supermundane insight is of 3 kinds: (1) joined with one of the 4 supermundane paths, (2) joined with one of the fruitions of these paths, (3) regarding the extinction, or rather suspension, of consciousness (s. nirodha-sama^patti).
See samatha-vipassana^, visuddhi, III-VII.
Literature: Manual of Insight, by Ledi Sayadaw (WHEL 31/32). Practical Insight Meditation, Progress of Insight, both by Maha^si Sayadaw (BPS). The Experience of Insight, by Joseph Goldstein (BPS).