Ud 8.3
PTS:Ud 80
Nibbāna Sutta: Parinibbana (3)
There is, bhikkhus, a not-born, a not-brought-to-being, a not-made, a not-conditioned. If, bhikkhus, there were no not-born, not-brought-to-being, not-made, not-conditioned, no escape would be discerned from what is born, brought-to-being, made, conditioned. But since there is a not-born, a not-brought-to-being, a not-made, a not-conditioned, therefore an escape is discerned from what is born, brought-to-being, made, conditioned.
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Ud 8.1
PTS:Ud 80
Nibbāna Sutta: Parinibbana (1)
There is, bhikkhus,
that base where there is no earth, no water, no fire, no air; no base consisting of the infinity of space,
no base consisting of the infinity of consciousness, no base consisting of nothingness, no base consisting of neither-perception-nor-non-perception; neither this world nor another world nor both; neither sun nor moon. Here, bhikkhus, I say there is no coming, no going, no staying, no deceasing, no uprising. Not fixed, not movable,
it has no support. Just this is the end of suffering.
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Pali-English Dictionary definition
Āyatana
Āyatana (nt.) [Sk. āyatana, not found in the Vedas; but freq. in BSk. From ā + yam, cp. āyata. The pl. is āyatanā at S iv.70. -- For full definition of term as seen by the Pāli Commentators see Bdhgh's expln at DA i. 124, 125, with which cp. the popular etym. at KhA 82: "āyassa vā tananato āyatassa vā saŋsāradukkhassa nayanato āyatanāni" and at Vism 527 "āye tanoti āyatañ ca nayatī ti ā."] -- 1. stretch, extent, reach, compass, region; sphere, locus, place, spot; position, occasion (corresponding to Bdhgh's definition at DA i.124 as "samosaraṇa") D iii.241, 279 (vimutti˚); S ii.41, 269; iv.217; v.119 sq., 318. sq.; A iii.141 (ariya˚); v.61 (abhibh˚, q. v.) Sn 406 (rajass˚ "haunt of passion" = rāgādi -- rajassa uppatti -- deso SnA 381); J i.80 (raj˚). Freq. in phrase araññ˚ a lonely spot, a spot in the forest J i.173; VvA 301; PvA 42, 54. -- 2. exertion, doing, working, practice, performance (comprising Bdhgh's definition at DA i.124 as paññatti), usually -- ˚, viz. kamm˚ Nd1 505; Vbh 324, 353; kasiṇ˚ A v.46 sq., 60; Ps i.28; titth˚ A i.173, 175; Vbh 145, 367; sipp˚ (art, craft) D i.51; Nd2 505; Vbh 324, 353; cp. an˚ non -- exertion, indolence, sluggishness J v.121. -- 3. sphere of perception or sense in general, object of thought, sense -- organ & object; relation, order. -- Cpd. p. 183 says rightly: "āyatana cannot be rendered by a single English word to cover both sense -- organs (the mind being regarded as 6th sense) and sense objects". -- These āyatanāni (relations, functions, reciprocalities) are thus divided into two groups, inner (ajjhattikāni) and outer (bāhirāni), and comprise the foll.: (a) ajjhatt˚: 1. cakkhu eye, 2. sota ear, 3. ghāna nose, 4. jivhā tongue, 5. kāya body, 6. mano mind; (b) bāh˚: 1. rūpa visible object, 2. sadda sound, 3. gandha odour, 4. rasa taste, 5. phoṭṭhabba tangible object, 6. dhamma cognizable object. -- For details as regards connotation & application see Dhs trsl. introduction li sq. Cpd. 90 n. 2; 254 sq. -- Approximately covering this meaning (3) is Bdhgh's definition of āyatana at DA i.124 as sañjāti and as kāraṇa (origin & cause, i. e. mutually occasioning & conditioning relations or adaptations). See also Nd2 under rūpa for further classifications. -- For the above mentioned 12 āyatanāni see the foll. passages: D ii.302 sq.; iii.102, 243; A iii.400; v.52; Sn 373 (cp. SnA 366); Ps i.7, 22, 101, 137; ii. 181, 225, 230; Dhs 1335; Vbh 401 sq.; Nett 57, 82; Vism 481; ThA 49, 285. Of these 6 are mentioned at S i.113, ii.3; iv.100, 174 sq.; It 114; Vbh 135 sq., 294; Nett 13, 28, 30; Vism 565 sq. Other sets of 10 at Nett 69; of 4 at D ii.112, 156; of 2 at D ii.69. -- Here also belongs ākāsɔ ānañcɔ āyatana, ākiñcaññ˚ etc. (see under ākāsa etc. and s. v.), e. g. at D i.34 sq., 183; A iv.451 sq.; Vbh 172, 189, 262 sq.; Vism 324 sq. -- Unclassified passages: M i.61; ii.233; iii.32, 216, 273; S i.196; ii.6, 8, 24, 72 sq.; iii.228; iv.98; v.426; A i.113, 163, 225; iii.17, 27, 82, 426; iv.146, 426; v.30, 321, 351, 359; Nd1 109, 133, 171, 340; J i.381 (paripuṇṇa˚); Vbh 412 sq. (id.).
-- uppāda birth of the āyatanas (see above 3) Vin i.185. -- kusala skilled in the ā. M iii.63. -- kusalatā skill in the spheres (of sense) D iii.212; Dhs 1335. -- ṭṭha founded in the sense -- organs Ps i.132; ii.121.
This sphere cannot be detected by the senses, only by negation of what can be sensed. In that regard, it has no sense-base associated with it.