Here’s an informative quote from the “Dictionary of Biblical Theology” under “Heart”:
Quote:
…In our present used of the word hardly anything is suggested except the affective life; while in the Hebrew the heart is understood as the “inside” of man in a far wider sense. Apart from feelings (2 Sam 15:13; Ps 21:3; Is 65:14), the heart contains memories and ideas, plans and decisions. God has given men “a heart to think with” (Si 17:6), and the psalmist speaks of the “thoughts of the heart” of God Himself, meaning His plan of salvation, which lasts from age to age (Ps 33:11). A “big heart” (1 Ki 5:9) suggests extensive knowledge; “give me your heart” can mean “give me your attention” (Pr 23:26)… According to the context the meaning can be restricted to the intellectual aspect (Mk 8:17) or on the contrary extend beyond it (Ac 7:51). Often it is necessary to go back beyond the psychological distinctions to the core of man’s being, to the place where he enters into dialogue with himself (Gn 17:17; Dt 7:17), accepts his responsibilities and opens himself or closes himself to God. In the concrete and global anthropology that we find in the Bible, man’s heart is the very source of his conscious, intelligent and free personality, the place of his decisive choices, the place of the unwritten Law (Ro 2:15) and of the mysterious action of God. In the OT as in the NT the heart is the place where man meets God, an encounter which becomes fully effective in the human heart of the Son of God.