BIBLE GREEK WORD STUDY
Kardia (καρδία) — Meaning & Usage in the Bible
καρδία (kardia) refers to the heart as the inner center of a person's thoughts, will, and emotions.
Meaning of the word
καρδία literally denotes the physical heart, but in the New Testament it is used almost entirely figuratively as the seat of a person's inner life — thoughts, intentions, desires, and emotions. The lexicon entry groups these under 'the thoughts or feelings (mind),' showing that kardia is not limited to affection but encompasses the whole inner orientation of a person.
In the example verses, kardia is the place where moral and spiritual decisions occur: it is where lust is kindled (Matthew 5:28), where treasure is directed (Matthew 6:21), and where a person may be either 'pure' or 'hardened' (Matthew 5:8; Romans 2:5). It therefore functions as the inner counterpart to outward behavior, and Scripture addresses it as the true location of faithfulness or sin.
The phrase 'by analogy) the middle' in the lexicon hints at the word's spatial sense. While this is a secondary use, it underlines that kardia points to the center of a person — the core from which the whole self is oriented.
Usage in Scripture
In the Gospels, kardia is the place Jesus addresses directly: he blesses the 'pure in heart' (Matthew 5:8), exposes lust as a covenant violation already committed there (Matthew 5:28), and warns that desire and devotion follow what the heart treasures (Matthew 6:21). In John's farewell discourse, the disciples' hearts are troubled, filled with sorrow, and promised joy (John 14:1; 16:6, 22) — showing that the inner life of faith is located in the kardia.
In Luke's account of the early church, kardia marks the response to the gospel. Peter's hearers are 'pricked in their heart' and the community eats with 'gladness and singleness of heart' (Acts 2:26, 37, 46). In Romans, Paul diagnoses the pagan condition as a 'darkened' and 'hardened' heart that stores up wrath (Romans 1:21, 24; 2:5), making kardia the central target of both condemnation and renewal.
The word in detail
- G2588 καρδία is defined as the heart, used figuratively for the thoughts, feelings, and will — the inner center of a person. Its appearance across the Gospels, Acts, and Romans consistently marks the heart as the true site of moral and spiritual orientation, not merely emotion.
Example verses
- Matthew 5:8 The 'pure in heart' are promised the vision of God. kardia here is the seat of moral and spiritual integrity, not just emotion.
- Matthew 6:21 The heart follows treasure, revealing kardia as the place of ultimate affection and allegiance.
- Acts 2:37 The hearers are 'pricked in their heart,' showing kardia as the place where the gospel convicts and prompts response.
- Romans 1:21 A 'senseless heart' is darkened, depicting kardia as the inner center where knowledge of God is either honored or futile.
Common questions
Does kardia mean only emotion?
No. The lexicon entry defines it as the thoughts or feelings (mind), and the example verses show it functioning as the seat of moral choices, affections, and will — not simply feeling.
Is kardia ever used literally for the physical heart?
The phrase 'by analogy) the middle' allows a spatial sense, but in the New Testament examples provided the word is used figuratively for the inner life of a person.
Why does Scripture focus on the heart?
Because the example verses treat the heart as the true seat of moral and spiritual orientation — where lust, devotion, grief, and conviction all occur — addressing the heart addresses the person at the root.