📖 Biblical Definition
"Reins" — the KJV translation of the Hebrew kelayot, literally kidneys — names what biblical psychology calls the seat of innermost will, conscience, and emotional truth. The reins are deeper than the heart’s surface sentiment; they are the inner core where motive lives. "The righteous God trieth the hearts and reins" (Psalm 7:9); "I the LORD search the heart, I try the reins, even to give every man according to his ways" (Jeremiah 17:10); "Examine me, O LORD, and prove me; try my reins and my heart" (Psalm 26:2). Modern English keeps a fossil of the meaning in the verb "to rein in" — to restrain from the inside. God’s eye reaches the reins. Submit them.
📜 Webster 1828 Definition
REINS, n. plu.
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1. The kidneys; one of two glands on the loins. 2. In scripture, the inward parts; the seat of the affections and passions.
📖 Key Scripture
Psalm 7:9 — "For the righteous God trieth the hearts and reins."
Psalm 139:13 — "For thou hast possessed my reins."
Jeremiah 17:10 — "I the Lord search the heart, I try the reins, even to give every man according to his ways."
Revelation 2:23 — "I am he which searcheth the reins and hearts."
⚠️ Modern Corruption
Modern man pretends his inmost self is hidden; the Lord searches the reins.
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Jeremiah 17:9-10 is one of the most uncomfortable diagnoses in Scripture: the heart is deceitful above all things, and desperately wicked; who can know it? I the Lord search the heart, I try the reins. The deception runs so deep that the heart hides itself from itself. Only the Lord sees to the bottom.
Modern man pretends his inmost self is hidden, curated, or self-defined. Scripture says it is fully visible — not just to nudging conscience but to the searching Lord. The good news is that what He sees, He can heal. The new heart of Ezekiel 36:26 is the cure for the diagnosed reins. Submit to the search; receive the new heart.
🔗 Greek & Hebrew Roots
Hebrew kelayot (H3629).
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H3629 — kelayot — kidneys; reins; inmost being
G3510 — nephros — kidney; reins (Rev 2:23)
Usage
"Modern man pretends his inmost self is hidden; the Lord searches the reins."
"The heart hides from itself; only the Lord sees to the bottom."
"What He sees He can heal — the new heart is the cure."