'For your own good' is a persuasive argument that will eventually make a man agree to his own destruction.

'Twas blow for blow, disputing inch by inch, For one would not retreat, nor t'other flinch.

A half truth, like half a brick, is always more forcible as an argument than a whole one. It carries better.

A knock-down argument; 'tis but a word and a blow.

And there begins a lang digression About the lords o' the creation.

Any fact is better established by two or three good testimonies than by a thousand arguments.

Be calm in arguing; for fierceness makes Error a fault, and truth discourtesy.

Behind every argument is someone's ignorance.

Debate is the death of conversation.

Don't take the wrong side of an argument just because your opponent has taken the right side.