The well-bred contradict other people. The wise contradict themselves.
Oscar Wilde
When you resort to attacking the messenger and not the message, you have lost the debate.
Addison Whithecomb
"If you've got the truth you can demonstrate it. Talking doesn't prove it."
Robert A. Heinlein
There is only one rule for being a good talker - learn to listen.
Christopher Morley
The smart way to keep people passive and obedient is to strictly limit the spectrum of acceptable opinion, but allow very lively debate within that spectrum.
Noam Chomsky
Debate is masculine, conversation is feminine.
Amos Bronson Alcott
Every difference of opinion is not a difference of principle. We have called by different names brethren of the same principle.
Thomas Jefferson
When you have the facts on your side, argue the facts. When you have the law on your side, argue the law. When you have neither, holler.
Al Gore
Just as war is freedom's cost, disagreement is freedom's privilege.
Bill Clinton
We must not contradict, but instruct him that contradicts us; for a madman is not cured by another running mad also.
Antisthenes
I'm willing to admit that I may not always be right, but I am never wrong.
Samuel Goldwyn
A man never tells you anything until you contradict him.
George Bernard Shaw
Gold begets in brethren hate; Gold in families debate; Gold does friendship separate; Gold does civil wars create.
Abraham Cowley