Strong's Concordance
kardia: heart
Original Word: καÏδία, ας, ἡ
Part of Speech: Noun, Feminine
Transliteration: kardia
Phonetic Spelling: (kar-dee'-ah)
Short Definition: the heart, inner life, intention
Definition: lit: the heart; mind, character, inner self, will, intention, center.
HELPS Word-studies
2588 kardía – heart; "the affective center of our being" and the capacity of moral preference (volitional desire, choice; see P. Hughs, 2 Cor, 354); "desire-producer that makes us tick" (G. Archer), i.e our "desire-decisions" that establish who we really are.
[Heart (2588 /kardía) is mentioned over 800 times in Scripture, but never referring to the literal physical pump that drives the blood. That is, "heart" is only used figuratively (both in the OT and NT.]