Epithets are not arguments. Abuse does not persuade.
Some degree of abuse is inseparable from the proper use of everything.
Before you try to convince anyone else be sure you are convinced, and if you cannot convince yourself, drop the subject.
Opposition inflames the enthusiast, never converts him.
A long dispute means that both parties are wrong.
I am not arguing with you – I am telling you.
What occasions the greater part of the world’s quarrels? Simply this: Two minds meet and do not understand each other in time enough to prevent any shock of surprise at the conduct of either party.
The difficult part in an argument is not to defend one’s opinion but rather to know it.
The most savage controversies are those about matters as to which there is no good evidence either way.
Somebody has to have the last word. If not, every argument could be opposed by another and we’d never be done with it.