לֵבָב

In Hebrew thought, the לֵבָב is not primarily the seat of emotion — it is the seat of personhood. The heart in the Old Testament is where a person thinks, wills, decides, and intends. It is the control center of the inner life, the inner place from which actions flow. When the Shema commands Israel to love Yahweh with all their לֵבָב (Deut 6:5), it is not primarily commanding an emotional state. It is commanding total orientation of the inner self — every thought, decision, and commitment — toward God. This is why lēbāb can be translated variously as 'heart,' 'mind,' 'understanding,' or 'will' in English — the Hebrew word encompasses all of these as a unified faculty.

The Old Testament's diagnosis of the human problem is fundamentally a problem of the לֵבָב. The heart of humanity is described as deceitful above all things (Jer 17:9). Hearts are hardened (Exod 4:21), uncircumcised (Deut 10:16), inclined toward idolatry (Deut 29:18). The Torah's commands keep bouncing off hearts that do not love Yahweh from the inside. This diagnosis creates the need for the great prophetic promise: God will circumcise the heart (Deut 30:6), write his law there (Jer 31:33), and replace the stony heart with a heart of flesh (Ezek 36:26). The new covenant is, at its core, a heart surgery.

For the preacher, לֵבָב frames the gospel as addressing the person at depth. External conformity to religious expectation without inner transformation is precisely the target of the prophetic critique. Jesus picks up the same diagnosis — the Pharisees clean the outside while the inside remains corrupt. The new birth that the NT announces is the fulfillment of the heart-transformation the prophets promised: a new heart capable of genuinely loving God and walking in his ways, not because of external compulsion but because of internal renovation.

לֵבָב appears approximately 252 times in the Hebrew Bible, concentrated in the Torah (especially Deuteronomy), the Psalms, and the prophetic literature. Deuteronomy uses it to define the whole-person demand of covenant love. The Psalms use it as the site of personal encounter with God — both in its failure (a divided heart, a hardened heart) and in its renewal (a clean heart, a steadfast heart). The prophets use it to announce the diagnosis of covenant failure and the promise of inner renewal.