In the Bible, the word "heart" could refer to one's a) mind b) desires c) will d) attitude and e) conscience. It also refers to other non-physical internal activities of man. "For from within, out of the heart of men...(Mr 7:21)
* It could refer to the mind:
Mr 2:8 But immediately, when Jesus perceived in His spirit that they reasoned thus within themselves, He said to them, "Why do you reason about these things in your hearts?
Mt 15:19 "For out of the heart proceed evil thoughts...
* It could refer to one's desires:
Ro 10:1 Brethren, my heart's desire and prayer to God for Israel is that they may be saved.
* It could refer to the will:
Ro 6:17 But God be thanked that though you were slaves of sin, yet you obeyed from the heart that form of doctrine to which you were delivered.
Obedience requires the will.
* It could refer to one's attitude:
Mr 7:21 "For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders,
22 "thefts, covetousness, wickedness, deceit, lewdness, an evil eye, blasphemy, pride, foolishness.
* It could refer to the conscience:
1Jo 3:20 For if our heart condemns us, God is greater than our heart, and knows all things.