The most savage controversies are those about matters as to which there is no good evidence either way.
-Bertrand Russell

Most quarrels amplify a misunderstanding.
-Andre Gide

Quarrel not at all.No man resolved to make the most of himself can spare time for personal contention.Still less can he afford to take all the consequences,including the vitiating of his temper and loss of self-control.Yield larger things to which you can show no more equal right;and yield lesser ones,though clearly your own.Better give your path to a dog than be bitten by him in contesting for the right.Even killing the dog would not cure the bit.
-Abraham Lincoln

I never make the mistake of arguing with people for whose opinion I have no respect.
-Edward Gibbon

Arguments out of a petty mouth are unanswerable.
-Joseph Addison

Never contend with a man who has nothing to lose.
-Baltasar Gracian y Morales

Fools must be rejected not by arguments,but by facts.
-Flavius Josephus