Verse 14. - The heart of him that hath understanding seeketh knowledge (Proverbs 18:15). The wise man knows that he knows nothing, and is always seeking to learn more.

Σοφία γάρ ἐστι καὶ μαθεῖν ο} μὴ νοεῖς

"To learn what thou hast never thought is wisdom." The mouth of fools. Another reading, is "the face of fools;" but the former is more suitable to what follows. Feedeth on foolishness. So the Vulgate and Septuagint, "The mouth of the undisciplined knoweth evil." The fool is always gaping and devouring every silly, or slanderous, or wicked word that comes in his way, and in his turn utters and disseminates it.

15:14. A wise man seeks to gain more wisdom, growing in grace and in the knowledge of Christ. But a carnal mind rests contented, flattering itself. 15. Some are much in affliction, and of a sorrowful spirit. Such are to be pitied, prayed for, and comforted. And others serve God with gladness of heart, and it prompts their obedience, yet they should rejoice with trembling.The heart of him that hath understanding seeketh knowledge,.... He that has in his heart an understanding of divine and spiritual things, of the Gospel and of the truths of it, will seek earnestly and diligently in the use of proper means after more knowledge; as he will desire to know more of Christ, his person, offices, and grace, he will follow on to know him, and not be content with the present degree of knowledge he has attained unto; he will hear and read the word, and pray and meditate, in order to come to a more perfect knowledge of the son of God, and of those things which relate to his spiritual peace and eternal welfare;

but the mouth of fools feedeth on foolishness; on foolish talking and jesting; on foolish and unlearned questions; on foolish and false doctrines; on foolish and hurtful lusts; on wind and ashes, a deceived heart having turned them aside: they take pleasure and satisfaction in those things; feed their fancy with them and feast upon them, which shows what fools they are; and such all unregenerate men be.