I have searching keyword " citta "…in Pali on all Suttas… and found no explanation of this term.
While Buddha given every term of 5 aggregates… what is rūpa(form)… to … viññān(Conciseness)
Buddha given every term of "Paṭiccasamuppād "(dependent of origination)… and other.
BUT when come to " Citta "…there is no definition.
My understanding is, in that era, " Citta “…shall be a common term which everyone known… therefore, Buddha no need to define this term. Same like " sweet, sour, bitter…” no need to define.
It can be seen in " assutavāta sutta "…that
Ordinary person (assutavā puthujjano) section –
Buddha mentioned… body vs Citta(mind) or Mano(thought) or Vinna(sensing)
Ariya person (sutavā ariyasāvako) section –
Buddha mentioned…
rūpa(body) vs vedanā(feeling) & saññā &
& saṅkhāra & viññān
This is because their concept of consciousness was different to the western. In Buddhism there are six forms of consciousness according with each of the senses (including mind).
“Feeling, perception, & consciousness are conjoined, friend, not disjoined. It is not possible, having separated them one from another, to delineate the difference among them. For what one feels, that one perceives. What one perceives, that one cognizes. Therefore these qualities are conjoined, not disjoined, and it is not possible, having separated them one from another, to delineate the difference among them.”—Majhima Nikaya 43
The Buddhist view is helpful because an unwholesome mind state for example, can be identified as a consciousness complete with feeling and perception. Mental formations are then able to challenge that consciousness, preferably by understanding its origin, and investigating the wrong perception which caused it to arise, or blocking it by one of the tactics in Majhima Nikaya 20.
If you have a friendly heart, this is ‘citta’. It is not ‘friendly consciousness’ or ‘friendly intellect’. If you have intelligent mind, it is intelligent intellect (mano) rather than ‘intelligent heart’ (‘citta’). If you have clear discerning consciousness, it is not ‘discerning heart’ (‘citta’).