Hebrews 3:12,13

Take heed Βλεπετε, see to it, consider, use care and circumspection; brethren, lest Μηποτε, lest at any time; there be in any of you As there was in your forefathers of old; he speaks to them collectively, to take care that none might be found among them with such a heart as he guards them against, and consequently his caution concerned every individual of them; an evil heart of unbelief Unbelief is the parent of all evil, and the very essence of it lies in departing frown God, as the living God The fountain of all our life, holiness, and happiness. For as faith draws near to him in the consideration and knowledge of him, in beholding his glory, in desire after him, gratitude to him, and delight in him; continually aspiring after a conformity to him, and longing to enjoy union and communion with him; so unbelief produces directly contrary effects, rendering the mind averse to approach God in these respects and for these purposes, disliking and shunning all intercourse with him. It is distinguished by some into negative and positive. Negative unbelief is wherever any believe not, or have not faith, because they have not yet had the means of believing, namely, the Scriptures, or the truths declared in them, as the heathen nations. Such, supposing they believe and lay to heart the truths of what is called natural religion, cannot be said to have in them an evil heart of unbelief. 2d, Positive unbelief is where men believe not, though they enjoy the means of faith. This latter is here meant, and in it consist some of the highest workings of the depraved nature of man; it being, on many accounts, the greatest provocation of God that a creature can be guilty of. For it is an opposition to God in all the perfections of his nature, and in the whole revelation of his will. And therefore the gospel, which is a declaration of grace, mercy, and pardon, and which indeed condemns all sin, yet denounces final condemnation only against this sin, he that believeth not shall be damned, Mark 16:16.

Observe reader, the apostle's caution against a heart of unbelief implies two things: 1st, That we take heed lest, through refusing to consider the evidence of the truth, or the goodness and excellence of the things proposed to be embraced by our faith, we should continue in our natural unbelief, and never attain faith. 2d, Lest we should reject or decline from the faith after it has been received, through neglect of the means which minister to its continuance and increase, namely, the word of God, prayer, Christian fellowship, the Lord's supper, &c.; through yielding to the temptations of the devil, the world and the flesh, and to the love of sin; through unwatchfulness and the neglect of self-denial and mortification; through relapsing into our former habits, and imitating the spirit and conduct of the carnal and worldly part of mankind around us; through fear of reproach, of ill-usage and persecution from those that are enemies to the truth and grace of God. As a powerful means to prevent this from being the case, the apostle adds, exhort one another, &c. It is justly observed by Dr. Owen, that “many practical duties are neglected because they are not understood, and they are not understood because they are supposed to have no difficulty in them.” The duty of constant exhortation, that is, of persuading men to constancy and growth in faith, love, and obedience, to watchfulness and diligence in the ways of God, and attention to every duty which we owe to God, our neighbour, and ourselves, is the most important part of the ministerial office. It is, however, not confined to ministers: it must also be mutual among believers; and, in order to the right performance of it, the following things are necessary: 1st, A deep concern for one another's salvation and growth in grace. 2d, Wisdom and understanding in divine things. 3d, Care that only words of truth and soberness be spoken, for only such words will be attended with authority, and have the desired effect. 4th, Avoiding those morose and severe expressions which savour of unkindness, and using words of mildness, compassion, tenderness, and love, at least toward such as are well- disposed, and desirous to know and do the will of God. 5th, Avoiding levity, and always speaking with seriousness. 6th, Attention to time, place, persons, occasions, circumstances. 7th, A suitable example in the persons exhorting, giving weight and influence to every advice that is given, in imitation of the apostle, who could say, Be ye followers of me as I am of Christ. 8th, We must be unwearied in this duty, and exhort one another daily; and that not only in appointed meetings, but in every proper season, and on all fit occasions, whenever we happen to be in company one with another: and, lastly, while it is called today While the season for doing it continues; and therefore now, without delay, the time for performing this duty being both very short and very uncertain.

As a motive impelling to the practice recommended, the apostle adds, lest any of you be hardened That Isaiah, 1 st, Rendered blind and insensible as to the nature, excellence, necessity, and importance of spiritual things: 2d, impenetrable to mercy or justice, promises or threatenings; to the word, providence, or grace of God; stubborn and irreclaimable: 3d, Abandoned, and finally given up of God to sin and its consequences. It should be well observed, that this awful effect is not usually produced suddenly, and all at once, but by slow degrees, and perhaps insensibly, just as the hand of a labouring man is wont gradually to contract a callousness. It is effected, the apostle says, by the deceitfulness of sin, probably first by yielding to, instead of resisting and mortifying, sinful dispositions and corrupt passions, which by degrees produce those sinful practices, which, 1st, Not only grieve, but quench and do despite to the Spirit of grace, and cause him to withdraw his influences from us. 2d, The mind becomes hereby indisposed, and averse to attend to, or to obey, the voice of God in his word or providence, to consider or to yield to his counsel and authority. Hereby, 3d, The conscience is stupified, the will, affections, and all the powers of the soul are preoccupied and engaged in the service of sin and Satan, of the world and the flesh. The apostle terms sin deceitful, because it promises the satisfaction it never yields: persuades us we may venture to yield a little to its solicitations, but need not go far; that we may yield at this time, this once, but need not afterward; that we may and can repent and reform when we will; that God will not be extreme to mark little things; and that he is merciful, and will not be so strict as ministers are wont to urge, in fulfilling his threatenings.