Proverbs 29:15

15 A rod and a reprimand impart wisdom, but a child left undisciplined disgraces its mother.

Read Proverbs 29:15 Using Other Translations

The rod and reproof give wisdom: but a child left to himself bringeth his mother to shame.
The rod and reproof give wisdom, but a child left to himself brings shame to his mother.
To discipline a child produces wisdom, but a mother is disgraced by an undisciplined child.