{21:22} Doctrine to the senseless is like fetters on the feet, and like chains on the right hand.
{21:23} A foolish man lifts up his voice in laughter. But a wise man will not even laugh quietly to himself.
{21:24} Doctrine is to the prudent like a gold ornament, and like an armband on the right arm.
{21:25} The feet of the foolish step easily into his neighbor’s house. But an experienced man will be apprehensive in the presence of the powerful.
{21:26} A senseless man will gaze through a window into the house. But a man who has been well-taught will stand outside.
{21:27} It is foolish for a man to listen through the door. And a prudent man will be grieved at this disgrace.

{21:15} Now there is a wisdom which abounds in evil. But there is no understanding where there is bitterness.
{21:16} The knowledge of the wise will increase like a flood, and his counsel will continue like a fountain of life.
{21:17} The heart of the foolish is like a broken vessel, for it will not hold any wisdom.
{21:18} A knowledgeable man will praise any wise word he hears, and he will apply it to himself. The self-indulgent man has heard it, and it displeases him, and so he casts it behind his back.
{21:19} The talk of the foolish is like a burden on a journey. But in the lips of the understanding, grace will be found.
{21:20} The mouth of the prudent is sought in the Church, and they will consider his words in their hearts.
{21:21} Like a house which has been demolished, so is wisdom to the foolish. And the knowledge of the unwise is like meaningless words.