(19) No harm has been done as yet. Still it is well to be upon your guard.

Simple concerning evil.--This is not at all the same word as that which is translated "simple" above. The first is that freedom from dishonest motives which makes a man an unsuspecting and easy prey for designing persons, and applies rather to natural bent and disposition. The second refers rather to the confirmed habit of one who has come in contact with evil, and is still uncontaminated by it; who has resisted all the plots and schemes that have been laid for him; and whose love for what is good and hatred of evil, has only been strengthened and disciplined. The word for "simple" here means "unmixed," "uncontaminated," "pure and clear."

16:17-20 How earnest, how endearing are these exhortations! Whatever differs from the sound doctrine of the Scriptures, opens a door to divisions and offences. If truth be forsaken, unity and peace will not last long. Many call Christ, Master and Lord, who are far from serving him. But they serve their carnal, sensual, worldly interests. They corrupt the head by deceiving the heart; perverting the judgments by winding themselves into the affections. We have great need to keep our hearts with all diligence. It has been the common policy of seducers to set upon those who are softened by convictions. A pliable temper is good when under good guidance, otherwise it may be easily led astray. Be so wise as not to be deceived, yet so simple as not to be deceivers. The blessing the apostle expects from God, is victory over Satan. This includes all designs and devices of Satan against souls, to defile, disturb, and destroy them; all his attempts to keep us from the peace of heaven here, and the possession of heaven hereafter. When Satan seems to prevail, and we are ready to give up all as lost, then will the God of peace interpose in our behalf. Hold out therefore, faith and patience, yet a little while. If the grace of Christ be with us, who can prevail against us?For your obedience is come abroad unto all men,.... That is, as the Arabic and Ethiopic versions render it, "the fame" and report of their obedience to the faith, to the doctrine of the Gospel, and the ministers of it, was spread everywhere, was well known to everyone, and spoken of with commendeth among all the churches in all nations: and this the apostle mentions as another reason why they should beware of false teachers, since it would be greatly to their reproach, should they, after all this, drop that form of doctrine which they had obeyed, desert the faithful ministers of the word, and follow these false teachers; should this be the case, they would be as notorious for their disobedience, as now for their obedience: and moreover, the apostle might hereby suggest, that whereas it was everywhere known how readily and at once they embraced the Gospel of Christ; this credulity and readiness to believe, which was their commendation, might have invited false teachers among them, who might hope and take encouragement from hence the more easily to gain upon them; and therefore they ought to be upon their watch and guard, and beware of them, and not believe every spirit:

I am glad therefore on your behalf; that they had so cheerfully and readily embraced the Gospel, and from the heart obeyed that form of doctrine delivered to them; and that their praise for this was in all the churches of Christ, and had everywhere a good report on this account:

but yet I would have you wise unto that which is good, and simple concerning evil; which is just the reverse of natural and unregenerate men, who are wise to do evil, but to do good they have no knowledge; some reference seems to be had to the words of Christ in Matthew 10:16; the apostle's meaning is, that though he rejoiced at the heartiness and simplicity of their obedience, and the credit they obtained abroad on account of it, yet was he not without his fears and jealousies concerning them; and could not but greatly wish them more wisdom to understand the doctrines of the Gospel, to discern things that differ, and approve that which is the most excellent, and hold fast that which is good; and with all their harmlessness, innocence, and simplicity, prudently guard against all evil doctrines and principles, such as might unawares lead them into bad practices, dishonourable to religion, and uncomfortable to themselves.