Matthew 7:15-20

Verse 15

Beware of false prophets - By false prophets we are to understand teachers of erroneous doctrines, who come professing a commission from God, but whose aim is not to bring the heavenly treasure to the people, but rather to rob them of their earthly good. Teachers who preach for hire, having no motive to enter into the ministry but to get a living, as it is ominously called by some, however they may bear the garb and appearance of the innocent useful sheep, the true pastors commissioned by the Lord Jesus, or to whatever name, class or party they may belong, are, in the sight of the heart-searching God, no other than ravenous wolves, whose design is to feed themselves with the fat, and clothe themselves with the fleece, and thus ruin, instead of save, the flock.
Verse 16

Ye shall know them by their fruits - Fruits, in the Scripture and Jewish phraseology, are taken for works of any kind. "A man's works," says one, "are the tongue of his heart, and tell honestly whether he is inwardly corrupt or pure." By these works you may distinguish (επιγνωσεσθε) these ravenous wolves from true pastors. The judgment formed of a man by his general conduct is a safe one: if the judgment be not favorable to the person, that is his fault, as you have your opinion of him from his works, i.e. the confession of his own heart.
Verse 17

So every good tree - As the thorn can only produce thorns, not grapes; and the thistle, not figs, but prickles; so an unregenerate heart will produce fruits of degeneracy. As we perfectly know that a good tree will not produce bad fruit, and the bad tree will not, cannot produce good fruit, so we know that the profession of godliness, while the life is ungodly, is imposture, hypocrisy, and deceit. A man cannot be a saint and a sinner at the same time. Let us remember, that as the good tree means a good heart, and the good fruit, a holy life, and that every heart is naturally vicious; so there is none but God who can pluck up the vicious tree, create a good heart, plant, cultivate, water, and make it continually fruitful in righteousness and true holiness.
Verse 18

A good tree cannot bring forth evil fruit - Love to God and man is the root of the good tree; and from this principle all its fruit is found. To teach, as some have done, that a state of salvation may be consistent with the greatest crimes, (such as murder and adultery in David), or that the righteous necessarily sin in all their best works, is really to make the good tree bring forth bad fruit, and to give the lie to the Author of eternal truth.
Verse 19

Every tree that bringeth not forth good fruit - What a terrible sentence is this against Christless pastors, and Christless hearers! Every tree that produceth not good fruit, εκκοπτεται, is to be now cut down; the act of excision is now taking place: the curse of the Lord is even now on the head and the heart of every false teacher, and impenitent hearer.
Verse 20

Wherefore by their fruits, etc. - This truth is often repeated, because our eternal interests depend so much upon it. Not to have good fruit is to have evil: there can be no innocent sterility in the invisible tree of the heart. He that brings forth no fruit, and he that brings forth bad fruit, are both only fit for the fire.
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