What is the heart according to the Bible?

Scripture shows that there is an intimate connection between the two, and that the heart exercises a considerable influence over the mind. When the declension of man from the knowledge of God to the darkness and corruption of heathendom is described, it is first stated that they "became vain in their imaginations and their foolish heart was darkened." It then follows that "even as they did not like to retain God in their knowledge, God gave them over to a reprobate mind" (Rom. 1:21, 28). The heart foolish and darkened was the precursor of the reprobate mind. Again, the apostle prays for the Ephesians that God would give them "the spirit of wisdom and revelation in the knowledge of him; the eyes of your heart (not, "understanding" as in the A.V.) being enlightened: that ye may know what is the hope of his calling," etc. So that it is clear that while the knowledge of God was lost through the darkening of the heart, the full knowledge of Him is now communicated through the enlightening of the heart. Since the heart therefore is the highway to every true and proper apprehension of the things of God, it is of the highest importance that the heart should be strictly guarded; even as it is said, "Keep thy heart with all diligence, for out of it are the issues of life" (Prov. 4:23). So the apostle writes to the Philippians, "And the peace of God which passeth all understanding shall keep your hearts and minds through Christ Jesus" (Phil. 4:7), thus pointing out what alone can form an efficient garrison for the central citadel of man's nature.

For scripture uniformly teaches that the heart is the core of man's being. It is the seat of the affections and of the impulses that carry man forward in the path of life. The Lord Himself declared to those who were content to make clean the exterior of the platter that there is a fountain of uncleanness within, which they entirely ignored. It is from the heart that proceeds every thing that defileth (Matt. 15:19). The evil heart of the natural man therefore gives a colour to his every action; for it is thence the mischief springs (Matt. 5:28, 1 John 3:15). On the other hand, the heart of the renewed man is so to characterise every action that it may prove good and acceptable before God. As servants of Christ we are to do "the will of God from the heart" (Eph. 6:6). To this end the love of God has been "shed abroad in our hearts by the Holy Ghost which is given unto us" (Rom. 5:5). Indeed the very Spirit of God Himself is in our hearts to originate and characterise every affection. This the apostle teaches, "Because ye are sons, God hath sent forth the Spirit of His Son into your hearts, crying, Abba, Father" (Gal. 4:6; 2 Cor. 1:22).

This fact is of great moment to such as have learnt the deceitfulness of the natural heart (Jer. 17:9). We are not left to ourselves to produce proper feelings Godward. He Who gives us right thoughts of God and the Father gives us right feelings too. For He is the Spirit of love as well as of a sound mind (2 Tim. 1:7). It is He, Who fills the heart with such a sense of the incomparable love of God Rom. 5:5) that out of the abundance of the heart the mouth speaks (Matt. 12:34-35; Luke 6:45).

The heart is often referred to in scripture as the seat of the affections and of the passions, also of wisdom and understanding — hence we read of 'the wise in heart,' also the Lord gave to Solomon 'a wise and understanding heart.' It is the centre of a man's being. But before the deluge God's verdict of man was that every imagination of the thoughts of his heart was only evil continually. Gen. 6:5. A similar verdict is found in Gen. 8:21, after Noah came out of the ark. And the Lord said, Out of the heart of man proceed evil thoughts and every form of wickedness. Mark 7:21. The law required man to love God with all his heart. The reception of the gospel must be in the heart, Rom. 10:9; and God enables a hearer to receive the good news in 'an honest and good heart,' upon which there is fruit. Luke 8:15. In new creation there is a 'pure heart,' the Christian being led by the Holy Spirit. 1 Tim. 1:5; 2 Tim. 2:22; 1 Peter 1:22.

In Scripture the heart is the centre of the thoughts, the affections and the will (Matt. 9:4; 12:34; 24:48), that is, the inner “switchboard” of man. This is why the writer of the Proverbs had already said, “Keep thy heart more than anything that is guarded; for out of it are the issues of life” (Prov. 4:23). This is an important warning!

297 As to soul and spirit, spirit is the upper part, and life was communicated to the body through it. Soul, when you make the difference, is that which you have in common with the beasts. The word is used in the Hebrew for everything; conscience, soul, spirit, and heart. Heart thus is really a figure, for else it is a piece of my flesh connected with the circulation of the blood. Take "if our heart condemn us not," there it is in the sense of conscience: "Love God with all thy heart," there it is the affections.

297 As to soul and spirit, spirit is the upper part, and life was communicated to the body through it. Soul, when you make the difference, is that which you have in common with the beasts. The word is used in the Hebrew for everything; conscience, soul, spirit, and heart. Heart thus is really a figure, for else it is a piece of my flesh connected with the circulation of the blood. Take "if our heart condemn us not," there it is in the sense of conscience: "Love God with all thy heart," there it is the affections.

The "soul" in Scripture is the seat of the emotions, love, hate, pity, longing, lust, appetite, and of the life also of the body. It is the sensitive nature, including in man what we usually call the heart. If "knowledge" is also ascribed to it, we can readily understand this, speaking as we do also of knowledge of the heart: but the seat of true intellect is the spirit.

The spirit and soul are always viewed in Scripture with perfect consistency in this manner. Scripture is always self-consistent, and never loose in what it says. The faculties proper to man, the mental and moral judgment are ascribed to the spirit; the sensitive instinctive, emotional nature is ascribed to the soul. Yet there is a knowledge that can be ascribed to the soul, as there is a joy of the spirit; and if "heart" be substituted for "soul," and "mind" for "spirit" we can understand this without realizing any confusion or inconsistency in the matter.

The spirit and soul are always viewed in Scripture with perfect consistency in this manner. Scripture is always self-consistent, and never loose in what it says. The faculties proper to man, the mental and moral judgment are ascribed to the spirit; the sensitive, instinctive, emotional nature is ascribed to the soul. Yet there is a knowledge that can be ascribed to the soul, as there is a joy of the spirit; and if "heart" be substituted for "soul," and "mind" for "spirit," we can understand this without realizing any confusion or inconsistency in the matter.

God claims the attention of the whole man (ver. 5) — heart, eyes, ears; and note, it is the inner man first. The heart stands for the inner springs of man's being and life. As from this organ of our physical frame the blood goes forth to energize the whole of the body's wonderful structure, returning to it to be again prepared for continued work in the circulatory system, so in the spiritual realm we have, as we may say, man's spirit and soul, the sea of his intellectual and emotional faculties which are manifested in his course of life. These are claimed by God, and as being under His control (other control can only result in spiritual death) there goes forth into the spiritual sphere, into all its paths of movement, of circulation, of feeling and emotion, that vital energy which makes us fit vessels for divine service. Then our vision (the eyes) will be full of that light which shines from the innermost Sanctuary enlightening the inner man; and one Voice will be heard, whose accents falling upon the multitudinous strings of our spiritual ears, send those vibrations of divine speech and harmony through our being which bring the desired response to the Master.

The prophet is told to mark well, literally, "set thine heart to," what Jehovah is making known. This is called for in view of the service he is to perform, that of communicating God's mind to the people. It is well for us to remember that such occupation with what God may give is ever essential for the carrying out of any commission He may call upon us to fulfil. Purpose of heart is the necessary qualification for any servant of the Lord. One may possess much learning and great natural ability, be attractive in person and eloquent in speech, and yet useless, because the heart is not right, its purpose not formed in the secret place with God. If the inner man is under the power of divine things it is certain that the members of the outward man will be yielded in happy service to the holy and perfect will of God. God looks upon the heart, not upon the outward appearance, which may easily deceive.

Man's moral centre is the heart. Out of it proceed seven streams of deadly evil, showing the inward moral pollution which the history of fallen man, from Cain downwards, has abundantly proved to be true.