SEV Biblia, Chapter 7:18
No puede el buen rbol llevar malos frutos, ni el rbol podrido llevar frutos buenos.
Clarke's Bible Commentary - Matthew 7:18
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.
John Gill's Bible Commentary
Ver. 18. A good tree cannot bring forth evil fruit , etc.] A man that is unprincipled with the grace of God, has an experimental acquaintance with the Gospel of Christ, and is guided by the Spirit of God into all truth, as it is in Jesus, cannot knowingly deliver, maintain, and abide by any doctrine that is contrary to the glory of Gods grace, and the person of Christ, the work of the Spirit, the fundamental doctrines of the Bible; or what is repugnant to the experiences of Gods people, and prejudicial to their souls. Neither can a corrupt tree bring forth good fruit . A corrupt preacher, one destitute of the truth of the Gospel, reprobate concerning the faith, who never had any experience of the doctrines of grace, and denies them in the theory of them, cannot, consistent with himself, and his own principles, deliver, or preach good doctrine; or that which tends to produce any good fruit, either in the experience or lives of men. It is true, a corrupt man, that is, an unregenerate man, may preach sound doctrine, it being what he believes, though he has no experience of it: but then this man is not a corrupt tree, that is, a corrupt preacher, though a corrupt man. As our Lord means by a good tree, not a good man, barely, or one that is made so by the grace of God; but a good minister, one that is furnished by the Spirit of God, and is well instructed in the kingdom of heaven: so by a corrupt tree he does not mean a corrupt man, a man that is in a state of nature, habitually and practically evil; but a corrupt preacher, a false prophet or teacher, that has sucked in corrupt principles, and has nothing else in him, and therefore can bring forth no other.
Matthew Henry Commentary
Verses 15-20 - Nothing so much prevents men from entering the strait gate, an becoming true followers of Christ, as the carnal, soothing, flatterin doctrines of those who oppose the truth. They may be known by the drif and effects of their doctrines. Some part of their temper and conduc is contrary to the mind of Christ. Those opinions come not from God that lead to sin.
Greek Textus Receptus
ου 3756 PRT-N δυναται 1410 5736 V-PNI-3S δενδρον 1186 N-NSN αγαθον 18 A-NSN καρπους 2590 N-APM πονηρους 4190 A-APM ποιειν 4160 5721 V-PAN ουδε 3761 ADV δενδρον 1186 N-NSN σαπρον 4550 A-NSN καρπους 2590 N-APM καλους 2570 A-APM ποιειν 4160 5721 V-PAN