Iron sharpeneth iron; so a {g} man sharpeneth the countenance of his friend.

(g) One hasty man provokes another to anger.

Wesley's Notes

27:17 Iron - Iron tools are made sharp and fit for use, by rubbing them against the file, or some other iron. The countenance - The company or conversation of his friend.

Jamieson-Fausset-Brown Bible Commentary

17. a man sharpeneth . friend-that is, conversation promotes intelligence, which the face exhibits.

Matthew Henry's Concise Commentary

27:15,16. The contentions of a neighbour may be like a sharp shower, troublesome for a time; the contentions of a wife are like constant rain. 17. We are cautioned to take heed whom we converse with. And directed to have in view, in conversation, to make one another wiser and better. 18. Though a calling be laborious and despised, yet those who keep to it, will find there is something to be got by it. God is a Master who has engaged to honour those who serve him faithfully. 19. One corrupt heart is like another; so are sanctified hearts: the former bear the same image of the earthly, the latter the same image of the heavenly. Let us carefully watch our own hearts, comparing them with the word of God. 20. Two things are here said to be never satisfied, death and sin. The appetites of the carnal mind for profit or pleasure are always desiring more. Those whose eyes are ever toward the Lord, are satisfied in him, and shall for ever be so. 21. Silver and gold are tried by putting them into the furnace and fining-pot; so is a man tried by praising him. 22. Some are so bad, that even severe methods do not answer the end; what remains but that they should be rejected? The new-creating power of God's grace alone is able to make a change. 23-27. We ought to have some business to do in this world, and not to live in idleness, and not to meddle with what we do not understand. We must be diligent and take pains. Let us do what we can, still the world cannot be secured to us, therefore we must choose a more lasting portion; but by the blessing of God upon our honest labours, we may expect to enjoy as much of earthly blessings as is good for us.

Matthew Henry's Whole Bible Commentary

Verse 17

This intimates both the pleasure and the advantage of conversation. One man is nobody; nor will poring upon a book in a corner accomplish a man as the reading and studying of men will. Wise and profitable discourse sharpens men's wits; and those that have ever so much knowledge may by conference have something added to them. It sharpens men's looks, and, by cheering the spirits, puts a briskness and liveliness into the countenance, and gives a man such an air as shows he is pleased himself and makes him pleasing to those about him. Good men's graces are sharpened by converse with those that are good, and bad men's lusts and passions are sharpened by converse with those that are bad, as iron is sharpened by its like, especially by the file. Men are filed, made smooth, and bright, and fit for business (who were rough, and dull, and inactive), by conversation. This is designed, 1. To recommend to us this expedient for sharpening ourselves, but with a caution to take heed whom we choose to converse with, because the influence upon us is so great either for the better or for the worse. 2. To direct us what we must have in our eye in conversation, namely to improve both others and ourselves, not to pass away time or banter one another, but to provoke one another to love and to good works and so to make one another wiser and better.