A fool finds no pleasure in understanding but delights in airing his own opinions.

Related:

• A fool finds pleasure in evil conduct, but a man of understanding delights in wisdom.
  Miscellaneous...
• Do not answer a fool according to his folly, or you will be like him yourself.
  Miscellaneous...
• A fool gives full vent to his anger,
  but a wise man keeps himself under control Miscellaneous...
• A fool shows his annoyance at once, but a prudent man overlooks an insult.
  Miscellaneous...
• Even a fool is thought wise if he keeps silent, and discerning if he holds his tongue.
  Miscellaneous...
• If a generalist delights to find a law he is ecstatic when he finds a law about laws.
  If laws in his eyes are good, laws about laws are delicious...
• When friends ask, there is no tomorrow.
  Miscellaneous...
• Hunger finds no fault with the
  cookery. --...
• So many men, so many opinions; every one his own way.
  Publius Terentius Afer...