Indriya (literally "belonging to or agreeable to Indra") is the Sanskrit and Pali term for physical strength or ability in general, and for and specifically refers to the five spiritual faculties, the five or six sensory faculties, and the twenty-two phenomenological faculties.
Indriya, literally "belonging to or agreeable to Indra," chief deity in the Rig Veda and lord of the Trāyastriṃśa heaven (also known as Śakra or Sakka in Buddhism), hence connoting supremacy, dominance and control, attested in the general meaning of "power, strength" from the Rig Veda.
In Buddhist Sanskrit and Pali the term generally refers to physical strength or ability in general, and more specifically to the five spiritual faculties, the five or six sensory faculties, or the twenty-two phenomenological faculties.
In the Pali Canon's Sutta Pitaka, the "five spiritual faculties" (Pali: pañc' indriyāni), which contribute to an awake state of mind, are:[citation needed]
SN 48.10 is one of several discourses that characterizes these spiritual faculties in the following manner:
In SN 48.51, the Buddha declares that, of these five faculties, wisdom is the "chief" (agga).
The five faculties are listed in the seven sets of qualities lauded by the Buddha as conducive to Enlightenment.
In AN 6.55, the Buddha counsels a discouraged monk, Sona, to balance or "tune" his spiritual faculties as one would a musical instrument:
Relatedly, the Visuddhimagga and other post-canonical Pali commentaries caution against one spiritual faculty overpowering and inhibiting the other four faculties, and thus generally recommend modifying the overpowering faculty with the investigation of states (see dhamma vicaya) or the development of tranquillity (samatha). Moreover, these commentaries especially recommend that the five spiritual faculties be developed in counterbalancing dyads:[citation needed]
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The commentator Buddhaghosa adds:
In SN 48.43, the Buddha declares that the five spiritual faculties are the Five Powers and vice versa. He uses the metaphor of a stream passing by a mid-stream island; the island creates two streams, but the streams can also be seen as one and the same. The Pali commentaries remark that these five qualities are "faculties" when used to control their spheres of influence, and are "powers" when unshakeable by opposing forces.
In the Sutta Pitaka, six sensory faculties are referenced in a manner similar to the six saḷāyatana ('centers of experience', 'six sense bases'). These faculties consist of the five senses with the addition of "mind" or "thought" (mana).
The first five of these faculties are sometimes referenced as the five material faculties (e.g., pañcannaṃ indriyānaṃ avakanti).
In the Abhidhamma Pitaka, the notion of indriya is expanded to the twenty-two "phenomenological faculties" or "controlling powers" (Pali: bāvīsati indriyāni) which are:
According to the post-canonical Visuddhimagga, the 22 faculties along with such constructs as the aggregates, sense bases, Four Noble Truths and Dependent Origination are the "soil" of wisdom (paññā).
At times in the Pali Canon, different discourses or Abhidhammic passages will refer to different subsets of the 22 phenomenological faculties. Thus, for instance, in the Abhidhamma there are references to the "eightfold form-faculty" (aṭṭhavidhaṃ indriya-rūpaṃ) which includes the first five sensory faculties (eye, ear, nose, tongue and body faculties) plus the three physical faculties (femininity, masculinity and vitality).