Yield therefore fruits worthy of repentance. He confirms what I have already said, that the repentance, which is attested by words, is of no value, unless it be proved by the conduct: for it is too important a matter to be estimated lightly, or at random. And so John affirms, that the solemn declaration, which they made, is not enough, but that, in process of time, their works will make it evident, whether or not they have seriously repented. It ought to be observed, that good works (Titus 3:8) are here called fruits of repentance: for repentance is an inward matter, which has its seat in the heart and soul, but afterwards yields its fruits in a change of life. But as the whole of this part of doctrine has been grievously corrupted by Popery, we must attend to this distinction, that repentance is an inward renewal of the man, which manifests itself in the outward life, as a tree produces its fruit.

Bring forth therefore fruits - That is, the proper fruits of reformation; the proper evidence that you are sincere. Do not bring your cunning and dissimulation to this work; do not carry your hypocrisy into your professed repentance, but evince your sincerity by forsaking sin, and thus give evidence that this coming to Jordan to be baptized is not an act of dissimulation. No discourse could have been more appropriate or more cutting.
Fruits - Conduct. See Matthew 7:16-19.
Meet for repentance - Fit for repentance; appropriate to it the proper expression of repentance.

(3) Bring forth therefore fruits meet for repentance:
(3) True repentance is an inward thing which has its seat in the mind and heart.

Bring forth therefore fruits,.... That is, if you are truly penitent, if you have a proper sense of sin, and true repentance for it, do such works as are suitable to it, and will show the genuineness of it; for
fruits meet for repentance are the same as "works meet for repentance", Acts 26:20 and as a tree is known by its fruit, so repentance is known by good works; these are the fruits and effects of repentance, and which are proofs with men of the sincerity of it. Those which follow upon evangelical repentance are such as are mentioned in 2-Corinthians 7:11. Now let it be observed, that John insisted upon repentance, and a good conversation, attesting the truth of it as necessary prerequisites to the ordinance of baptism; and so Peter first urged repentance; and then proposed baptism, Acts 2:38 from whence one should think it may be rationally and strongly concluded, that none but truly repenting sinners, and such who have given proofs that they are so, are to be admitted to this ordinance.

Bring forth therefore fruits--the true reading clearly is "fruit";
meet for repentance--that is, such fruit as befits a true penitent. John now being gifted with a knowledge of the human heart, like a true minister of righteousness and lover of souls here directs them how to evidence and carry out their repentance, supposing it genuine; and in the following verses warns them of their danger in case it were not.

Bring forth, therefore, fruits meet for repentance. There is no repentance whatever unless there is a change of life as the result. The change of life is the proof of the change of heart.

Repentance is of two sorts; that which is termed legal, and that which is styled evangelical repentance. The former (which is the same that is spoken of here) is a thorough conviction of sin. The latter is a change of heart (and consequently of life) from all sin to all holiness.