Adam Clarke on Proverbs 8:5

O ye simple - פתאים pethaim, ye that are deceived, and with flattering words and fair speeches deluded and drawn away.

Ye fools - כסילים kesilim, ye stupid, stiffnecked, senseless people. That preaching is never likely to do much good, that is not pointed; specifying and describing vices, and charging them home on the consciences of transgressors. Where this is not done, the congregation is unconcerned; no man supposes he has any thing to do in the business, especially if the preacher takes care to tell them, "These were the crimes of Jews, Romans, Greeks, of the people at Corinth, Philippi, Thessalonica, Laodicea, and of heathens in general; but I hope better things of you, who have been born in a Christian land, and baptized in the Christian faith." Thus he arms their consciences in double brass against the good effects of his own teaching.