Proverbs is a collection — sayings gathered under the patronage of Solomon and copied out, the text tells us, "by the men of Hezekiah king of Judah" (Prov. 25:1). The audience is the young man being formed for public life in Israel: the future judge, husband, father, courtier. Chapter 27 is a string of one-line observations about friendship, flattery, and accountability. The Hebrew sage is not romantic about community. He assumes that left alone, a person dulls. Sharpness is a thing that happens between people, and only between people willing to strike against one another.

From the writers we read together

Dallas Willard

philosopher at USC, author of The Divine Conspiracy and Renovation of the Heart (1935-2013)

Willard insisted that spiritual formation is not a private project. He liked to point out that the New Testament knows nothing of a Christian who is not embedded in a body of other Christians who can see him, contradict him, and call him out. Proverbs 27:17 is the Old Testament rehearsal of that conviction. The sage assumes you cannot see the dull spots on your own edge. Someone has to come at you with their own iron and tell you the truth about the place where your blade has rounded over.

What Willard adds to the proverb is a warning. The friction has to be in service of a shared apprenticeship to Jesus, or it just becomes wounding. Two iron blades striking with no smith and no purpose make sparks and chips, not sharpness. The friend who sharpens you is not the friend who is hardest on you; it is the friend who is following Christ alongside you and is willing, when needed, to be uncomfortable for your sake. Find one. Be one. The Christian life was never meant to be done with a soft edge.