>From HENNY YOUNGMAN's Collection of One-liners (opinions)

Brains were made to think with -- but money forms most of the
  opinions.
Liberty of opinion is often just laziness of mind.
A radical is anyone whose opinions differ radically from mine.
Some people fall for everything and stand for nothing.
"Positive" means mistaken at the top of one's voice.
An obstinate man doesn't hold opinons, they hold him.
Public opinion is what people think other people are thinking.