Matthew Henry commentary on Proverbs 20:13-15
Embedded KJV/source Scripture
15 There is gold, and a multitude of rubies: but the lips of knowledge are a precious jewel.
The lips of knowledge (a good understanding to guide the lips and a good elocution to diffuse the knowledge) are to be preferred far before gold, and pearl, and rubies; for, 1. They are more rare in themselves, more scarce and hard to be got. There is gold in many a man's pocket that has no grace in his heart. In Solomon's time there was plenty of gold ( 1 Kings x. 21 ) and abundance of rubies; every body wore them; they were to be bought in every town. But wisdom is a rare thing, a precious jewel; few have it so as to do good with it, nor is it to be purchased of the merchants. 2. They are more enriching to us and more adorning. They make us rich towards God, rich in good works, 1 Tim. ii. 9, 10 . Most people are fond of gold, and a ruby or two will not serve, they must have a multitude of them, a cabinet of jewels; but he that has the lips of knowledge despises these, because he knows and possesses better things.
Embedded KJV/source Scripture
16 Take his garment that is surety for a stranger: and take a pledge of him for a strange woman.
Two sorts of persons are here spoken of that are ruining their own estates, and will be beggars shortly, and therefore are not to be trusted with any good security:—1. Those that will be bound for any body that will ask them, that entangle themselves in rash suretiship to oblige their idle companions; they will break at last, nay, they cannot hold out long; these waste by wholesale. 2. Those that are in league with abandoned women, that treat them, and court them, and keep company with them. They will be beggars in a little time; never give them credit without good pledge. Strange women have strange ways of impoverishing men to enrich themselves.
Embedded KJV/source Scripture
17 Bread of deceit is sweet to a man; but afterwards his mouth shall be filled with gravel.
Note, 1. Sin may possibly be pleasant in the commission: Bread of deceit, wealth gotten by fraud, by lying and oppression, may be sweet to a man, and the more sweet for its being ill-gotten, such pleasure does the carnal mind take in the success of its wicked projects. All the pleasures and profits of sin are bread of deceit. They are stolen, for they are forbidden fruit; and they will deceive men, for they are not what they promise. For a time, however, they are rolled under the tongue as a sweet morsel, and the sinner blesses himself in them. But, 2. It will be bitter in reflection. Afterwards the sinner's mouth shall be filled with gravel. When his conscience is awakened, when he sees himself cheated, and becomes apprehensive of the wrath of God against him for his sin, how painful and uneasy then is the thought of it! The pleasures of sin are but for a season, and are succeeded with sorrow. Some nations have punished malefactors by mingling gravel with their bread.