Heart
לֵב (lev)
The center of a person — the seat of mind, will, emotions, and spiritual life.
Lev is the Hebrew word for heart, referring not to the physical organ but to the total inner person — the center of thought, will, emotion, and moral character. The heart is where relationship with God either flourishes or fails.
"Keep thy heart with all diligence; for out of it are the issues of life." — Proverbs 4:23 (KJV)
Key Verses
Proverbs 4:23
“Keep thy heart with all diligence; for out of it are the issues of life.”Read in context
Jeremiah 17:9
“The heart is deceitful above all things, and desperately wicked: who can know it?”Read in context
Ezekiel 36:26
“A new heart also will I give you, and a new spirit will I put within you.”Read in context
Strong's Concordance
Strong's H3820 — Heart (לֵב (lev))
Browse the full lexicon entry and every KJV verse where לֵב (lev) appears.
Open Strong's H3820Etymology and Original Meaning
Lev (also levav) means 'heart' — but in Hebrew thought, the heart is far more than the seat of emotions. It is the center of the entire inner person: thinking, reasoning, choosing, feeling, and relating to God. When the Bible says 'heart,' it means the real you — the core of personhood from which everything else flows.
The Heart in the Old Testament
Solomon asked for a 'wise and understanding heart' (1 Kings 3:12) — wisdom was a heart quality. The Shema commands loving God 'with all thine heart' (Deuteronomy 6:5) — total devotion. Proverbs warns, 'Keep thy heart with all diligence' (Proverbs 4:23). The heart is the command center of life: what controls the heart controls the person.
The Problem of the Heart
Jeremiah's diagnosis is devastating: 'The heart is deceitful above all things, and desperately wicked' (Jeremiah 17:9). Sin is ultimately a heart problem — not merely wrong behavior but a corrupted center. The flood came because 'every imagination of the thoughts of his heart was only evil continually' (Genesis 6:5). External compliance without heart change is hypocrisy.
The New Heart
God's solution is radical surgery: 'A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart... and I will give you an heart of flesh' (Ezekiel 36:26). This is regeneration — God replacing the corrupted core with a responsive, Spirit-filled heart. The new covenant is written on the heart (Jeremiah 31:33), not on stone tablets.
Frequently Asked Questions
What does heart mean in the Bible?
Heart (lev) is the center of the inner person — encompassing mind, will, emotions, and moral character. It is the command center from which all of life flows (Proverbs 4:23).
What is the new heart God promises?
In Ezekiel 36:26, God promises to replace the 'stony heart' (hardened by sin) with a 'heart of flesh' (responsive to Him). This is spiritual regeneration — a new core that desires and delights in God's ways.
Which Bible verse uses the word "Heart"?
Proverbs 4:23 — "Keep thy heart with all diligence; for out of it are the issues of life" (KJV). It also appears in Jeremiah 17:9, Ezekiel 36:26.
Why does the Hebrew word behind "Heart" matter?
Lev (also levav) means 'heart' — but in Hebrew thought, the heart is far more than the seat of emotions. English uses one word, "Heart", where the Hebrew לֵב (lev) carries the fuller sense: the center of a person — the seat of mind, will, emotions, and spiritual life.
Related Words
Related Reading
Continue your study with related content from across our library:
Heart (לֵב (lev))
The center of a person — the seat of mind, will, emotions, and spiritual life.
Strong's H3820 — Heart
לֵב (lev) • The center of a person — the seat of mind, will, emotions, and spiritual life.
Guard/Keep (שָׁמַר (Shamar))
To guard, keep, watch over, or protect with careful attention.
Strong's H8104 — Guard/Keep
שָׁמַר (Shamar) • To guard, keep, watch over, or protect with careful attention.
Biblical Meaning of Blood in a Dream (KJV)
Life, atonement, and covenant with God.
Biblical Meaning of Wine in a Dream (KJV)
Joy, covenant, and — in excess — a warning.
Where to go next
Studied the meaning of Heart? Continue with these word-study and Scripture pages.
- Bible word meanings A–ZHebrew and Greek words explained in plain English.Continue
- Go deeper with word studiesStrong's numbers, usage and every KJV occurrence.Continue
- Bible questions answered from ScriptureStraight KJV answers to common questions.Continue
- Read the KJV Bible online freeFull text, chapter by chapter.Continue