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That is properly called deceitful which presents objects in a false light, or leads to a misconception of the nature of things within us and around us. And that is properly called deceitful which conceals its own true character, and assumes the appearance of what it is not.

1. One of the ways in which the deceitfulness of the heart manifests itself is in its tendency to blind the understanding in regard to religious truth. To have the mind darkened with ignorance, or perverted by error, is inconsistent with the exercise of holiness, or the practice of true virtue. Evidence is always on the side of truth; but that evidence may be overlooked, or so distorted, that the truth may not be perceived, and instead of it error may be embraced and defended as truth. The reason why the minds of men reject the truth is, the depravity of the heart. Infidelity, and every species of dangerous error, may be traced to the deceitfulness of the heart. If men possessed good and honest hearts, they would search diligently for the truth, and would be disposed to judge impartially of its evidence; and, as was said, evidence being on the side of truth, and the truth congenial with the moral feelings of the upright mind, it would always be embraced. Atheism itself is a disease rather of the heart than of the head. And idolatry, which darkens with its portentous shadows a large portion of our globe, owes its origin to the deceitfulness and wickedness of the human heart.

2. The exceeding deceitfulness of the heart appears in the delusive promises of pleasure, which it makes, in the indulgence of sinful desires. This is so uniformly the fact, that it is a common remark that men enjoy more pleasure in the pursuit of the objects of the world, than in their possession. This delusion of pleasure in prospect, particularly affects the young. With them experience is wanting, which serves to correct this error of the imagination; but even experience is insufficient to cure the disease. In this matter, the world does not become wiser by growing older. There is another deception of the heart which has relation to the indulgence of natural desires. The person may be apprehensive at first, from former experience, that some evil to soul or body may arise from unlawful indulgence. A pause is produced, and hesitation is felt; but appetite, when strong, pleads for indulgence, and is fruitful in pleas; among which none is more false and deceitful, than that if gratified in this instance, it will never crave indulgence any more. And this false promise often prevails with the vacillating sinner; and he plunges into the gulf, which is open to receive him.

3. Under the influence of an evil heart, everything appears in false colours. Not only does error assume the garb of truth, but piety itself is made to appear odious. Indeed, there is nothing upon earth which the carnal mind hates so truly as holiness. But as that which appears good cannot be hated, one art of the deceitful heart is, to misrepresent the true nature of piety and devotion. The fairest face when caricatured, becomes deformed, and appears ludicrous.

4. The deceitfulness of the heart is also exceedingly manifest in the false pretensions which it makes, and the delusive appearances which it assumes. And this deceitfulness not only imposes upon others, but upon the person himself. Under this delusion, men persuade themselves that they are not wicked, but that their hearts are good. Their virtues, or semblance of virtues, are magnified, when seen through the false medium of self-love; and their vices are so diminished, that they are either not seen, or appear as mere peccadilloes, scarcely deserving notice. Such persons are also deceived as to their own wisdom. But the most dangerous form of this deceit is, when persons, never converted or renewed, are induced to believe that they are saints.

5. The deceitfulness of the heart is manifest in the good which we promise ourselves that we will do in future. But the true test of character is, what we are actually doing at the present time. Do we now, from day to day, do all the good which is in our power? Do we now improve our time and talents to the utmost? If we do not, then does our heart deceive us, as to its own real disposition?

6. Another way in which our hearts deceive us is, by leading, us to judge of ourselves, not by a strict scrutiny into our real motives, but by viewing our character through the medium of public opinion, or through the favourable sentiments of our partial friends.Reflections —

1. If the heart be so exceedingly deceitful and wicked, we should be deeply humbled before God that we have hearts so evil.

2. If the heart be so deceitful, we should place no confidence in it.

3. If the heart be so deceitful, it should be watched with care.

4. From the state and character of the heart here given, we may infer the necessity of a change of heart; and everyone should be led to cry to God for renewing grace.

5. We should come often to the fountain which is opened for sin and uncleanness

6. If any of us have been made sensible of the deceitfulness and wickedness of our hearts, and have, in some degree, been delivered from this great evil of our nature, this change, we are sure, has not proceeded from ourselves.

(A. Alexander, D. D.)

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KJV: The heart is deceitful above all things, and desperately wicked: who can know it?

WEB: The heart is deceitful above all things, and it is exceedingly corrupt: who can know it?