Proverbs 29:15 in the World English Bible
The rod of correction gives wisdom, but a child left to himself causes shame to his mother.
Context
14 The king that faithfully judgeth the poor, his throne shall be established for ever.
15 The rod and reproof give wisdom: but a child left to himself bringeth his mother to shame.
16 When the wicked are multiplied, transgression increaseth: but the righteous shall see their fall.