Blows that hurt purifies the heart

Proverbs 20:30

New King James Version (NKJV)
Blows that hurt cleanse away evil,
As do stripes the inner depths of the heart.

New International Version
Blows and wounds scrub away evil, and beatings purge the inmost being.

New Living Translation
Physical punishment cleanses away evil; such discipline purifies the heart.

English Standard Version
Blows that wound cleanse away evil; strokes make clean the innermost parts.

New American Standard Bible
Stripes that wound scour away evil, And strokes reach the innermost parts.

King James Bible
The blueness of a wound cleanseth away evil: so do stripes the inward parts of the belly.